Hameed, Saad, Aysha Almas, Fahad Shabbir Ahmed, and Aamir H. Khan. “Descriptive Controlled Study Regarding the Effects of Negative Chronotropic Agents on Lowering Heart Rate and Morning Surge in a Tertiary Care Hospital ”. National Journal of Health Sciences 1, no. 1 (January 4, 2021): 25-29. Accessed May 1, 2024. https://ojs.njhsciences.com/index.php/njhs/article/view/153.