Qamar, Ambreen, et al. “OBSTRUCTIVE SLEEP APNOEA AND ROLE OF INTERLEUKIN-6 AS A CIRCULATORY BIOMARKER: A CROSS-SECTION STUDY”. Pakistan Journal of Physiology, vol. 17, no. 2, June 2021, pp. 15-19, https://pjp.pps.org.pk/index.php/PJP/article/view/1346.