Yousuf, Muhammad Saad, and Mohammad Irfan Akhtar. “MULTICENTER NATIONAL STUDY ON CARDIOPULMONARY BYPASS (CPB) PERFUSION PRACTICES DURING ADULT CARDIAC STUDY”. Pakistan Armed Forces Medical Journal, vol. 70, no. 2, Apr. 2020, pp. 425-32, https://pafmj.org/PAFMJ/article/view/4204.