Berdajs, Denis, Sotirios Marinakis, Ulf Kessler, Mirza Muradbegovic, Enrico Ferrari, and Ludwig K von Segesser. “Impaired Left Ventricular Function As a Predictive Factor for Mid-Term Survival in Octogenarians After Primary Coronary Artery Bypass Surgery”. Swiss Medical Weekly 142, no. 4546 (November 4, 2012): w13704. Accessed July 11, 2024. https://smw.ch/index.php/smw/article/view/1612.