Association between red blood cell distribution width and postoperative atrial fibrillation after cardiac surgery: A pilot observational study. (15th April 2015) - Korantzopoulos, Panagiotis; Sontis, Nikolaos; Liu, Tong; Chlapoutakis, Serafeim; Sismanidis, Sokratis; Siminelakis, Stavros; Apostolakis, Efstratios