RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES

The prevalence of chronic bronchitis in smokers is five times more than non-smokers. The prevalence is more in age group of 17yrs -65yrs. Sharp et al made studies on men in industrial area 19.6% had persistent cough, 16.7% had persistent expectoration and 10.7% had persistent cough and expectoration10. ................
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