1. Division of Cardiac Surgery and Valve Center, IRCCS Ospedale San Raffaele, Università Vita Salute , Via Olgettina 60, 20132 Milano, Italy
2. Department of Medicine, Columbia University Irving Medical Center , New York, 161 Fort Washington Avenue, 10032 New York, NY , USA
3. Minneapolis Heart Institute at Abbott Northwestern Hospital , 920 East 28th Street, Suite 100, 55407 Minneapolis, MN, USA
4. Bern University Hospital, University of Bern , Anna-Seiler-Haus Freiburgstrasse 20, 3010 Bern , Switzerland
5. Department of Cardiology, Universitätsmedizin Johannes Gutenberg-University , Langenbeckstraße 1, 55131 Mainz , Germany