Mirza, Tariq Mehmood, et al. “EXERCISE TOLERANCE TEST (ETT) OR MYOCARDIAL PERFUSION SCAN (MPS) � WHAT TO CHOOSE IN PATIENTS OF ISCHAEMIC HEART DISEASE (IHD)? Myocardial Perfusion Scan”. Pakistan Armed Forces Medical Journal, vol. 64, no. 2, June 2014, pp. 212-18, https://pafmj.org/PAFMJ/article/view/667.