Guidelines for reporting morbidity and mortality after cardiac valvular operations. The American Association for Thoracic Surgery, Ad Hoc Liaison Committee for Standardizing Definitions of Prosthetic Heart Valve Morbidity - Edmunds, L H, Jr; Clark, R E; Cohn, L H; Grunkemeier, G L; Miller, D C; Weisel, R D (Ann Thorac Surg, 1996)