[1] Brown Univ, Dept Med, Div Cardiol, Warren Alpert Med Sch, Providence, RI 02912 USA
[2] Ft Belvoir Community Hosp, Dept Med, Cardiol Serv, Ft Belvoir, VA USA
[3] Fujita Hlth Univ, Dept Cardiol, Aichi, Japan
[4] Univ Nebraska, Med Ctr, Cardiovasc Div, 982265 Nebraska Med Ctr, Omaha, NE 68198 USA