Khan T, Khan N ullah, Khan QI, Khan R muhammad, Atif Masood, Khan W. Frequency of Acute Exacerbation of COPD Among Non-smokers in Tertiary Care Hospital of Bannu KPK-Pakistan. jwmdc [Internet]. 2022 Sep. 8 [cited 2025 Oct. 4];1(2). Available from: https://www.jwmdc.com/jwmdc/article/view/17