[1] Momentum Res Inc, Durham, NC USA
[2] Duke Clin Res Inst, Durham, NC USA
[3] Univ Calif San Francisco, Cardiol Sect, Vet Affairs Med Ctr, San Francisco, CA 94143 USA
[4] Athens Univ Hosp, Athens, Greece
[5] Univ Calif San Diego, Adv Heart Failure Program, San Diego, CA 92103 USA
[6] Univ Med Ctr Groningen, Dept Cardiol, NL-9713 AV Groningen, Netherlands
[7] Univ Brescia, Brescia, Italy
[8] Corthera Inc, San Francisco, CA USA