1. Department of Cardiothoracic Surgery; Dartmouth Medical Center; Hanover NH USA
2. Center for Health and the Social Sciences (CHESS); University of Chicago; Chicago IL USA
3. Department of Medicine; University of Chicago; Chicago IL USA
4. Department of Surgery; Rutgers - New Jersey Medical School; Newark NJ USA
5. Division of Cardiac, Vascular and Thoracic Surgery; Department of Surgery; New York Presbyterian Hospital; Columbia University; New York NY USA
6. Section of Cardiac and Thoracic Surgery; Department of Surgery; University of Chicago; Chicago IL USA
7. Newark Beth Israel Medical Center; Barnabas Heart Hospitals; Newark NJ USA