Qamar, A., Qureshi, M., Nazar, S., Baig, S., Iffat, W. and Owais, M. (2019) “Physical activity and apnoea-hypopnea index in obstructive sleep apnoea”, Pakistan Journal of Physiology, 15(3), pp. 67-70. Available at: http://pjp.pps.org.pk/index.php/PJP/article/view/1116 (Accessed: 21February2020).