1. 1. Dyke C, Aronson S, Dietrich W, Hofmann A, Karkouti K, Levi M, et al. Universal definition of perioperative bleeding in adult cardiac surgery. J Thorac Cardiovasc Surg 2014;147:1458-63.e1.
2. 2. Karkouti K, Wijeysundera DN, Yau TM, Beattie WS, Abdelnaem E, McCluskey SA, et al. The independent association of massive blood loss with mortality in cardiac surgery. Transfusion 2004;44:1453-62.
3. 3. Karkouti K, Wijeysundera DN, Beattie WS, Callum JL, Cheng D, Dupuis JY, et al. Variability and predictability of large-volume red blood cell transfusion in cardiac surgery: A multicenter study. Transfusion 2007;47:2081-8.
4. 4. Society of Thoracic Surgeons Blood Conservation Guideline Task Force, Ferraris VA, Brown JR, Despotis GJ, Hammon JW, Reece TB, et al. 2011 update to the Society of Thoracic Surgeons and the Society of Cardiovascular Anesthesiologists blood conservation clinical practice guidelines. Ann Thorac Surg 2011;91:944-82.
5. 5. Ferraris VA, Ferraris SP. Limiting excessive postoperative blood transfusion after cardiac procedures. A review. Tex Heart Inst J 1995;22:216-30.