[1] Columbia Univ, Med Ctr, New York Presbyterian Hosp, Div Cardiol, New York, NY USA
[2] Cardiovasc Res Fdn, New York, NY USA
[3] Truven Hlth Analyt, Cambridge, MA USA
[4] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[5] Abiomed Inc, Danvers, MA USA