Ahmad H, Ashraf S, Farooqi R, Zaman M. FREQUENCY OF MODIFIABLE RISK FACTORS IN PATIENTS ADMITTED WITH ACUTE EXACERBATION OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE AT PULMONOLOGY UNIT, KHYBER TEACHING HOSPITAL, PESHAWAR. Pak J Chest Med [Internet]. 2015Jul.26 [cited 2026Apr.17];19(3). Available from: https://www.pjcm.net/index.php/pjcm/article/view/63