1. Department of Cardiothoracic Surgery Weill Cornell Medicine New York New York USA
2. Samuel J. Wood Library & C.V. Starr Biomedical Information Center, Weill Cornell Medicine New York New York USA
3. Department of Surgery University of Wisconsin School of Medicine and Public Health Madison Wisconsin USA
4. Division of Cardiothoracic Surgery, Department of Surgery University of Wisconsin School of Medicine and Public Health Madison Wisconsin USA