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Die invloed van die rookgewoonte op die simptome van die diffuse obstruktiewe pulmonale sindroom
(Health & Medical Publishing Group, 1981)
In a randomized sample of the Bellville population a high prevalence rate for smoking was found in men (71%) and women (38%). Of the smokers, 73% of men and 42% of women started smoking before the age of 21 years. On the ...