[1] Duke Univ, Sch Med, Durham, NC USA
[2] Duke Clin Res Inst, Durham, NC USA
[3] Duke Univ, Med Ctr, Duke Clin Res Inst, Durham, NC USA
[4] Indiana Univ Sch Med, Indianapolis, IN 46202 USA
[5] Baylor Coll Med, Durham, TX USA
[6] Ahmanson Univ Calif, Ronald Reagan UCLA Med Ctr, Los Angeles UCLA Cardiomyopathy Ctr, Los Angeles, CA USA