This is an HTML version of an attachment to the Freedom of Information request 'Atos doctors directives'.

 
 Medical Services 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ASBESTOS RELATED LUNG 
DISEASE 
 
 
 
 
 
 
Version 2 Final 
 
 
EBM – Asbestos Related Lung Disease 
Version: 2 Final 
MED/S2/CMEP~0053 (b) 
 
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Document control 
 
Version history 
Version Date 
Comments 
2 Final 
19 January 2007 
Signed off by MSCMT 
2e (draft) 
21 November 2006 
Comments from MSCMT incorporated 
2d (draft) 
14 November 2006 
Formatting 
2c (draft) 
5 November 2006 
External review by Dr L Ferguson 
2b (draft) 
11 September 2006 
Internal QA by Dr A Ferguson, Dr C Traquair 
and Dr B Jones 
2a (draft) 
 
Initial Draft 
 
 
 
Changes since last version 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EBM – Asbestos Related Lung Disease 
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Description 
Asbestos is the generic term for a group of fibrous minerals. 
 
Asbestos fibres are highly resistant to physical and chemical breakdown.  This gives 
them their commercial value in applications such as fireproofing, insulation, 
reinforced cement, and brake linings.  In 1970, a voluntary ban on the use of 
asbestos was introduced in the UK, and it was given legislative force in 1986. 
 
Asbestos was mined on a large scale in Canada, South Africa, and the former 
Soviet Union.  The asbestos-bearing rock was crushed to release the fibres, which 
were then processed, packed into impermeable bags and transported to the 
manufacturer. 
 
The main types of asbestos fibres are:  
 
  White (Chrysotile). 
Flexible and easily inhaled. 
  Blue (Crocidolite). 
Stiff, straight and able to travel deep into the lung. 
Very strongly associated with the development of mesothelioma. 
The most dangerous form of asbestos. 
  Brown (Amosite).   
Stiff, straight and able to travel deep into the lung. 
Associated with the development of mesothelioma. 
 
Inhalation of asbestos fibres can cause Asbestos Related Lung Disease:  
 
a) Asbestosis 
b) Pleural Plaque 
c)  Diffuse Pleural Thickening 
d) Mesothelioma. 
 
Asbestos related lung disease is increasing in prevalence, and is not expected 
to peak until 2020.[1]  
 
It is likely to become an increasingly common aspect of disability analysis 
medicine.   
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Aetiology 
Blue and brown asbestos fibres are thinner than 3m and longer than 10m.  (A 
human hair is 100m in diameter.) This makes the fibres narrow enough to be 
inhaled into the alveolar part of the lung, but too long to be removed by 
macrophages.  Asbestos fibres can persist in the body for decades. 
 
Fibrosis or ‘scarring’ of the lungs is caused by the body’s inflammatory response to 
the asbestos.   
 
In non-malignant asbestos related lung disease, the prevalence and severity of the 
conditions increase with increasing exposure to asbestos.[2][3]  
Asbestosis 
 
Asbestosis which is a symptom complex rather than a specific disease results in 
interstitial pulmonary fibrosis caused by the inhalation of asbestos.   
 
It was originally described in the 1900s and the importance of its occupational cause 
was recognised by epidemiological studies in the 1930s.  As early as the first 
century AD, Pliny recorded that the weavers of asbestos wicks for the lamps of the 
vestal virgins wore masks for respiratory protection. 
 
Asbestosis occurs in those who have had regular exposure.[2]  
 
However, women, whose only contact with asbestos has been washing their 
husband’s clothes, have developed asbestos related lung disease.[4]  
Pleural Plaque  
 
This is an area of local fibrous thickening on the lung pleura.   
 
The likelihood of developing pleural plaques increases with increased exposure to 
inhaled asbestos.  They generally develop 10 to 20 years after exposure.   
 
Pleural plaque is usually asymptomatic, and often presents as an incidental finding 
on a CXR.[4]  
Diffuse Pleural Thickening  
 
This is uniform smooth thickening of the pleura. 
 
Pleural effusions cause inflammation and fibrosis.  Recurrent episodes lead to 
pleural thickening. 
 
Diffuse pleural thickening is like a ‘straight jacket’ around the lungs.  The more it 
spreads, the more it limits lung expansion. 
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Benign Mesothelioma  
 
Benign fibrous mesothelioma is a rare tumour.  It is neither associated with exposure 
to asbestos nor related to the development of malignant mesothelioma.  It will not be 
discussed further in this protocol. 
Malignant Mesothelioma 
 
Mesothelioma is a malignant tumour of mesothelial cells derived from the pleura 
(most common), pericardium (rare) and peritoneum (rare.) The tumour begins as a 
local mass, often associated with a pleural effusion.  It gradually spreads to encase 
the lungs and extends to involve the chest wall and the pericardium.  However, 
clinical problems associated with metastatic spread are uncommon. 
 
Prior exposure to asbestos is a prerequisite for the diagnosis of mesothelioma 
as a prescribed disease PD D3. 
 
In heavily exposed individuals, the lifetime risk of developing mesothelioma is 
approximately 10%.  Individuals who have never been exposed to asbestos have a 
lifetime risk of only one in a million.  However, there does not seem to be a simple 
relationship between the amount of exposure and the risk of developing 
mesothelioma.[4]  
 
Exposure to blue (crocidolite) asbestos poses the greatest risk. 
 
The latent period after exposure is between 15 and 40 years, so mesothelioma 
usually presents between the ages of 50 and 70.[4]  
 
Mesothelioma affects five men for every affected woman.  This reflects traditional 
patterns of employment.[4]  
 
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Epidemiology 
The prevalence of asbestos related lung disease is increasing and is expected to 
peak around 2020.[1][5]  
Mesothelioma 
 
  Mesothelioma caused 1527 deaths in the UK during 1998.[5]  
  1032 new cases of mesothelioma were confirmed in the UK during 1999.[6]  
  Due to the natural history of the disease, (it has an exceptionally long latent 
period), the death rate from mesothelioma is expected to increase to 3300 per 
annum by 2020.[1]  
  All occupational lung disease has risen rapidly since the late 1980s due to a 75% 
increase in the number of mesothelioma deaths.[5]  
  Men born in the 1940s are the worst affected cohort.  Malignant mesothelioma 
may account for about 1% of all their deaths.[4] 
Non-Malignant Asbestos Related Lung Disease 
 
  Benign asbestos related lung disease was the largest cause of new cases of 
occupational respiratory disease in the UK during 1999.  (1256 new cases, 28% of 
the total.)[6]  
  From100 - 150 new cases of asbestosis are confirmed in the UK each year.[4]  
  Pleural plaques are the most frequent manifestation of asbestos related lung 
disease.[2]  
 
 
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Diagnosis 
The Occupational History is crucial in reaching a diagnosis.   
 
Asbestos exposure typically affects people who have worked in the following 
industries: 
 
a)  Construction and Building 
b)  Ship Building (especially pipe-laggers and plumbers)  
c) Dock 
Workers 
d) Demolition 
e) Asbestos 
Production 
f)  Rail Workers.   
 
Evidence from the occupations recorded on Death Certificates suggests that 
building workers, especially plumbers, gas fitters, carpenters and electricians are the 
largest high-risk group. 
Asbestosis 
Symptoms 
 
The early stages of asbestosis are asymptomatic.  When symptoms develop, 
patients complain of a non-productive cough, and breathlessness on sustained 
exertion.   

Examination 
 
The Key Finding On Examination: 
 
Fine end-inspiratory crackles, which persist or increase after coughing.   
 
Finger clubbing is a late, non-specific, feature of asbestosis.  Cyanosis is often 
present in the latter stages of asbestosis and is usually attributable to concomitant 
COPD.  Chest expansion is usually reduced.  (Patients often complain that they 
have difficulty taking a deep breath.) 
Investigations 
 
Pulmonary Function Tests 
 
In the early stages of asbestosis, lung function is normal.   
 
As asbestosis progresses, pulmonary function tests reveal a ‘restrictive’ impairment 
of lung function.  (The FVC and FEV1 are reduced, but the ratio of FEV1/FVC is 
normal or increased.)  
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Gas Transfer Factor is reduced.   
 
Definitions: 
 
 
FVC is the Forced Vital Capacity. 
 FEV1 is Forced Expiratory Volume in 1 second. 
 
Gas Transfer Factor measures the transfer of inspired carbon monoxide into 
the pulmonary circulation, and thus indicates the efficiency of oxygen transfer 
in the lungs.   
 
Pulmonary function tests are useful for screening and for monitoring 
progression.   
 
Radiology[7] 
 
CXR is frequently normal in the early stages of the disease. 
 
In the late stages of extensive asbestosis, the CXR may show a typical basal 
‘honeycombed appearance.’  
 
High resolution CT scanning is the investigation of choice. 
Management 
 
After diagnosis, cases of asbestosis usually remain under the care of a Consultant 
Respiratory Physician, and are subject to annual review in the chest clinic until it is 
clear that the condition is stable.  Deterioration in the condition should prompt a re-
referral to the clinic. 
There is no specific treatment for asbestosis but treatment will be that appropriate to 
the condition it may trigger. 
Pleural Plaque  
Symptoms 
 
This condition is usually asymptomatic.  (If plaques become very large and 
widespread, symptoms of breathlessness and cough may develop, and the clinical 
presentation will start to resemble the early stages of diffuse pleural thickening.) 
Examination 
 
Usually there are no specific clinical findings on examination.  In extensive disease, 
reduced chest expansion and quiet breath sounds may be found. 
 
 
 
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Investigations 
 
CXR most often shows multiple bilateral pleural plaques.[7]   (The plaques may be 
calcified.) 
Management 
 
Once the initial diagnosis has been made, routine clinic review is not normally 
required. 
Diffuse Pleural Thickening  
Symptoms 
 
Diffuse pleural thickening usually presents following recurrent episodes of pleuritic 
pain.   
Cough and breathlessness on exertion are accompanying features. 
Examination 
 
Chest expansion is reduced, and the breath sounds are quiet.   
Investigations 
 
As the disease progresses, pulmonary function tests reveal a ‘restrictive’ impairment 
of lung function.   
Impairment of the Gas Transfer Factor correlates with the degree of pleural 
thickening. 
Management 
 
After diagnosis, cases of diffuse pleural thickening usually remain under the care of 
a Consultant Respiratory Physician, and are subject to regular review in the chest 
clinic until it is clear that the condition is stable.  Deterioration in the condition should 
prompt a re-referral to the clinic. 
Mesothelioma  
Symptoms 
 
Mesothelioma typically presents with chest pain, shortness of breath, day and night 
sweats and weight loss.  (Patients will sometimes describe a persistent flu-like 
illness.) 
 
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Examination 
 
Finger clubbing is rare.  Cyanosis is not a feature unless end stage respiratory 
failure is present. 
Tumour invasion commonly occurs at the biopsy site.  In advanced disease, tumour 
deposits may be visible or palpable in the chest wall. 
Chest expansion becomes increasingly reduced as the condition progresses. 
Stony dullness on percussion and reduced air entry indicates the presence of a 
pleural effusion. 
Investigations 
 
CXR may show features suspicious of mesothelioma.  Pleural effusion is a common 
finding.  CT scanning is the radiographic investigation of choice. 
 
A pleural biopsy is obtained for histology.   
 
If necessary, this is achieved by an open procedure with X-ray guidance. 
 
Immunohistochemistry and electron microscopic techniques help to distinguish 
mesothelioma from other tumours, such as adenocarcinoma.[8]  
 
CT and MRI scanning are also useful for determining tumour size and resectability.[8]  
Management 
 
Responsibility for the management of a case of mesothelioma is likely to be shared 
between a Respiratory Physician, a Thoracic Surgeon, an Oncologist and the 
Primary Care Team.  Their roles will depend on the clinical stage of the cancer and 
the patient’s prognosis. As the disease progresses management of these patients is 
likely to be shared with a palliative care physician. 
Differential Diagnosis of Asbestos Related Lung Disease 
 
The presence of pleural plaques is an indication of previous asbestos exposure.   
 
Occupational exposure to airborne pollutants and mineral dusts (for example, 
asbestos and coal,) is also associated with the development of COPD and interstitial 
lung disease.[9][9]  
 
a) COPD. 
 
(See Protocol ‘COPD’.) 
b) Asthma. 
 
(See Protocol ‘Asthma’.) 
c)  Other causes of Pleuritic Chest Pain: (e.g. Infection and Pulmonary Embolus.) 
d) Other causes of Pulmonary Fibrosis: (See Protocol ‘Interstitial Lung 
Disease.’) 
 
 
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Prevention and Treatment 
Prevention 
 
The prevention of asbestos related lung disease relies on the reduction of exposure 
to the fibres.  Workers in contact with asbestos are now required to wear protective 
clothing and breathe through sophisticated filters.  Industry has had to replace 
asbestos with alternative materials. 
 
Regular medical and radiological examination of workers who use or handle 
asbestos is a legal requirement.  The Health and Safety Executive is responsible for 
strict regulation of the industry.  There is some evidence that removal of the worker 
from exposure at an early stage is associated with slower progression of asbestos 
related lung disease.[2]  
 
It is especially important to avoid smoking because the interaction between smoking 
and asbestos increases the risk of developing lung cancer.[10] 
 
In the UK, reports of new cases of occupational respiratory disease by Respiratory 
and Occupational Physicians are collated by the SWORD and OPRA surveillance 
schemes.  These provide information about the incidence of asbestos related lung 
disease for research and for the development of protective regulations and 
legislation.[6] 
 
Mesothelioma, asbestosis, diffuse pleural thickening and primary carcinoma of the 
lung (where there is evidence of either asbestosis or bilateral diffuse pleural 
thickening) are Prescribed Diseases under the Industrial Injuries Provisions of the 
Social Security Contributions and Benefits Act 1982.   
 
  About 100 people with asbestosis are awarded Industrial Injury Scheme Benefit 
(IISB) each year.[4]  
  Pleural plaque is not a prescribed disease.   
  Even a tenuous history of asbestos exposure is accepted when a claim for 
mesothelioma is made. 
 
People who believe they have had occupational exposure to asbestos often choose 
to make a civil claim for compensation against their former employer. 
Treatment 
 
Currently, treatment of asbestos related lung disease is largely symptomatic and 
supportive. 
 
Associated diseases such as COPD and asthma are treated in the same as these 
conditions would be without history of asbestos exposure.  (See ‘COPD’ and 
‘Asthma’ Protocols.) 

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Oxygen therapy improves symptoms in the late stages of the diseases.   
 
Treatments for mesothelioma include supportive care, surgery, radiotherapy, and 
chemotherapy but, individually, these have not improved survival.  Recent trials 
suggest that combination treatment may offer an improvement in survival.  Radical 
surgery followed by chemotherapy and radiotherapy has achieved better outcomes, 
especially for patients with local disease.[8]  
 
Prophylactic radiotherapy following invasive procedures (drainage or biopsy) has 
been found to reduce the risk of seeding along the track A randomised study of 40 
patients reduced the risk of seeding from 40% to zero. [13]  
 
Pleural aspiration and pleurodesis help to relieve the breathlessness caused by 
pleural effusions. 
 
New treatments such as photodynamic therapy, targeted cytokines and gene 
therapy are under investigation.[8]  
 
Prognostic scoring systems have been developed which are capable of stratifying 
patients into groups depending on their clinical characteristics and then predicting 
their likely survival.  They help in the selection of participants for chemotherapy 
treatment trials.[11] 
 
The Primary Care Team and the Macmillan Service have a key role in providing 
palliative and supportive care for both the patient and their family. The MacMillan 
service is just one of many charities who, alongside the NHS, provide palliative care 
services for symptom control, psychosocial and spiritual support. Support is also 
available for carers and will continue following bereavement. 
 
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Prognosis 
Asbestosis 
 
Asbestosis is usually slowly progressive, with the speed of progression probably 
being related to the dose of asbestos to which the lungs have been subjected.[4]  
 
Asbestosis carries a five-fold increase in the risk of developing bronchial 
carcinoma.[10] 
 
There is evidence of a multiplicative increase in risk when asbestosis and smoking 
coexist.   
 
40 – 50% per cent of smokers with asbestosis die of bronchial carcinoma.[4][5][10][11]  
Pleural Plaque 
 
On its own, this condition carries a good prognosis.[7]  
Diffuse Pleural Thickening 
 
This disease is usually slowly progressive. 
Mesothelioma 
 
Mesothelioma still has a very poor prognosis.  Median survival is poor varying from 
8-14 months in different studies. [14] 
 
A few patients have indolent disease and may survive for up to 5 years.[4]  
 
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Main Disabling Effects 
The degree of disability caused by asbestos related lung disease depends on the 
particular condition.  (From mild pleural plaque disease, which is asymptomatic, to 
mesothelioma, which is rapidly fatal.)  
 
In non-malignant asbestos related lung disease, it is common to encounter 
concomitant conditions such as COPD and emphysema.  These may add to the 
respiratory impairment.   
Mesothelioma 
 
Chest pain, breathlessness and weakness are the main disabling features of 
mesothelioma. 
Non-malignant Asbestos Related Lung Disease 
 
NB.  Non-malignant asbestos related lung disease progresses slowly.   
 
The primary disablement from non-malignant asbestos related lung disease is 
impaired exercise tolerance.  Eventually, this might progress to the point that it limits 
‘walking quickly’ and ‘climbing flights of stairs.’ In end stage disease, even ‘washing’ 
and ‘dressing’ may become difficult. 
Assessing the Claimant 
 
The assessment should be made using all the information available.  This includes 
information from the claimant’s file, informal observations, medical history, ‘Typical 
Day’, and examination. 
 
  A key point to discover is whether the claimant is currently receiving active 
care from a Consultant. 
If so, it suggests that the condition has been newly diagnosed, or that it has 
become worse. 
If not, it suggests that the condition is stable, and that the rate of progression 
is slow.   
This information shows the current severity of the condition, and helps to 
predict the prognosis. 
 
It is important to discover the claimant’s reason for leaving employment.   
The condition may have been diagnosed several years earlier, and it is likely 
that the claimant would have been able to continue at work.  Was it due to 
respiratory impairment, an unrelated health problem, redundancy or some 
other circumstance?  
  The focus of the assessment should be directed at the most disabling 
condition.   
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For example, in the case of a dock worker who received a diagnosis of pleural 
plaque 5 years ago, continued at work, but then suffered a back injury 8 
months ago, the focus should be on the musculoskeletal system. 
  A particular feature of asbestosis is the breathlessness on sustained 
exertion.   
In the ‘Typical Day’ history, this might be illustrated by breathlessness on 
‘rushing for a bus’, ‘walking uphill’, or ‘climbing several flights of stairs.’ 
Activities such as ‘walking on level ground’ or ‘climbing a flight of twelve stairs’ 
would be unlikely to cause significant problems. 
  Variability is not a typical feature of non-malignant asbestos related lung 
disease. 
If the claimant describes variability in their disability, then it may due to 
concomitant disease or it may indicate inconsistency in their account. 
 
In the IB-PCA, exemption is likely to have been granted to claimants with 
mesothelioma by the Decision Maker, or advised at the medical scrutiny stage.  This 
condition is unlikely to be encountered during an IB-PCA examination session. 
 
For those with non-malignant asbestos related lung disease, exemption should be 
considered if effort tolerance is severely limited, the claimant is using oxygen 
therapy, or they have had to adapt their home, for example by installing a stair lift or 
converting a room downstairs for their bedroom. 
Psychological Effects 
 
When workers are notified that due to occupational exposure to asbestos, they are 
at risk of severe chronic or malignant lung disease, psychological problems may 
result.  Emotions such as anxiety or denial may affect their ability to process, 
remember, or act upon the information presented.  Efforts to consider the 
psychological impact of notification have been made.[12] 
 
The knowledge that the diagnosis of asbestosis or diffuse pleural thickening may 
progress to respiratory failure or develop into a cancer can be difficult to come to 
terms with, and may lead to reactive depression.  Similarly, the diagnosis of 
mesothelioma with its very poor prognosis can cause adjustment reactions not only 
for the patient, but also for their family.  Adjustment reactions occur in about 30% of 
cancer patients.[4]  
Causal attribution, anger and the burden of legal proceedings may contribute to the 
suffering experienced by people with mesothelioma.[15] 
 
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Reference List 
1. 
Peto J, Hodgson JT, Matthews FE, Jones JR.  Continuing increase in 
mesothelioma mortality in Britain.  Lancet 1995;345:535-9. 
2. 
Becklake MR.  Symptoms and pulmonary functions as measures of morbidity. 
 Annals of Occupational Hygiene 418;38:569-80. 
3. 
Beritic-Stahuljak D, Valic F, Zuskin E.  Relationship between cumulative 
occupational exposure to asbestos fibres and respiratory symptoms.  Acta 
Medica Croatica
 1991;45:283-95. 
4. 
The Oxford Textbook of Medicine on CD ROM.  Oxford University Press, 
1996. 
5. 
British Thoracic Society.  Burden of Lung Disease.  A statistics report from the 
British Thoracic Society.  2001. 
6. 
Meyer JD, Holt DL, Chen Y, Cherry NM, McDonald JC.  SWORD '99: 
surveillance of work-related and occupational respiratory disease in the UK.  
Occupational Medicine (Oxford) 2001;51:204-8. 
7. 
Peacock C, Copley SJ, Hansell DM.  Asbestos-related benign pleural disease. 
 Clinical Radiology 2000;55:422-32. 
8. 
Jaklitsch MT, Grondin SC, Sugarbaker DJ.  Treatment of malignant 
mesothelioma.  World Journal of Surgery 2001;25:210-7. 
9. 
Zejda JE.  Occupational exposure to dusts containing asbestos and chronic 
airways disease.  International Journal of Occupational Medicine & 
Environmental Health
 1996;9:117-25. 
10.  ABC of Work Related Disorders.  2nd Impression.  BMJ Publishing Group, 
2001. 
11.  Billings CG, Howard P.  Asbestos exposure, lung cancer and asbestosis.  
Monaldi Archives for Chest Disease 2000;55:151-6. 
12. 
Meyerowitz BE.  Assessing quality of life when planning and evaluating worker 
notification programs: two case examples.  American Journal of Industrial 
Medicine 
1993;23:221-7. 
13.  Boutin C. Rey F,Viallet JR. Prevention of malignant seeding after invasive 
diagnostic procedures in patients with pleural mesothelioma. A randomised trial 
of local radiotherapy. Chest 1995; 108:754-8 
14.  British Thoracic Society Standards of Care Committee. Statement on 
malignant mesothelioma in the United Kingdom (BTS statement). Thorax 2001; 
56(4): 250-265 
15.  Clayson H.Suffering in mesothelioma:concepts and contexts. Progress in 
Palliative Care 2003:11 :251-254. 
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Bibliography 
The Oxford Textbook of Medicine 3rd Edition.  CD-ROM.  Oxford University Press. 
Asbestosis.  Edited by A Seaton. 
Mesothelioma.  Edited by MK Benson. 
Lecture Notes in Respiratory Medicine 5th Edition.  SJ Bourke et al Blackwell 
Scientific. 
ABC of Work Related Disorders.  2nd Impression 2001.  Edited by David Snashall.   
BMJ Publishing Group. 
Practical Pulmonary Rehabilitation.  Edited by M Morgan, S Singh.  Chapman and 
Hall Medical. 
IARC monographs on the evaluation of carcinogenic risks to humans.  1972-1996 
Vol.  1-66.  International Agency for Research on Cancer.  Lyons. 
Burden of Lung Disease.  A statistics report from the British Thoracic Society.  Nov.  
2001. 
 
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