[1] Duke Univ, Sch Med, Dept Med, Durham, NC 27706 USA
[2] Duke Clin Res Inst, 2400 Pratt St,Room 0311 Terrace Level, Durham, NC 27705 USA
[3] Univ Calif Los Angeles, Ahmanson UCLA Cardiomyopathy Ctr, Los Angeles, CA USA
[4] Vet Affairs Palo Alto Hlth Care Syst, Dept Med, Palo Alto, CA USA
[5] Northwestern Univ, Feinberg Sch Med, Div Cardiol, Chicago, IL USA
[6] Novartis Pharmaceut, E Hanover, NJ USA
[7] Univ New Mexico, Div Cardiol, Sch Med, Albuquerque, NM USA