Chaudhry, Asma, Kaleem Ullah Toori, and Sumaira Saleem. 2018. “FREQUENCY AND RISK FACTORS OF FREQUENT EXACERBATIONS OF ASTHMA IN PATIENTS IN A TERTIARY CARE HOSPITAL: A HOSPITAL-BASED COMPARATIVE STUDY: Exacerbations of Asthma in Patients”. Pakistan Armed Forces Medical Journal 68 (2): 207-13. https://pafmj.org/PAFMJ/article/view/213.