Naeem, S. (2018) “COMPARISON OF HEART RATE VARIABILITY IN NEGATIVE AND POSITIVE RESPONDERS TO ACTIVE PHASE OF HEAD-UP TILT TEST”,
Pakistan Armed Forces Medical Journal, 68(6), pp. 1566–70. Available at:
https://www.pafmj.org/PAFMJ/article/view/2541 (Accessed: 12 June 2025).