[1] Univ Verona, Internal Med, Verona, Italy
[2] Duke Univ, Med Ctr, Dept Med, Div Cardiol, Durham, NC 27710 USA
[3] New York Methodist Hosp, Cardiol, New York, NY USA
[4] Houston Methodist DeBakey Heart & Vasc Ctr, Houston, TX USA
[5] Univ Minnesota, Dept Med, Div Cardiol, Box 736 UMHC, Minneapolis, MN 55455 USA
[6] Univ Illinois, Cardiol, Chicago, IL USA