PROSE: Prospective Randomized Trial of the On-X Mechanical Prosthesis and the St Jude Medical Mechanical Prosthesis Evaluation : Part 1(Patient Dynamics): Preoperative demographics and preoperative and operative risk factors. - Jamieson, W. R. Eric; Ely, John L.; Brink, Johan; Pennel, Timothy; Bannon, Paul; Patel, Jashvant; Kumar Gupta, Rajiv; Mohan Rao, Prasanna Simha; Agrawal, Damyanti; Wiklund, Lars; Kappetein, A. Pieter; Haaverstad, Rune; et al. (Journal of Cardiothoracic Surgery, 2021)