Qayyum, F., Malik, S. Q., Qureshi, A. T., & Diju, A. (2020). Peak expiratory flow rates in smoker asthmatics versus non-smoker asthmatics: a comparative analysis. Pakistan Journal of Physiology, 16(4), 10–12. Retrieved from https://pjp.pps.org.pk/index.php/PJP/article/view/1255