[1] Duke Univ, Med Ctr, Durham, NC USA
[2] Momentum Rsch Inc, Rsch, Durham, NC USA
[3] Univ Hull, Kingston Upon Hull, Yorks, England
[4] DCRI, Durham, NC USA
[5] Univ Calif San Francisco, San Francisco, CA 94143 USA
[6] Vet Affairs Med Ctr, San Francisco, CA 94121 USA
[7] Univ Brescia, Brescia, Italy
[8] Univ Groningen, Univ Med Ctr Groningen, Groningen, Netherlands
[9] Brigham & Womens Hosp, Boston, MA 02115 USA
[10] Kardiol Klin, Wroclaw, Poland
[11] Duke Univ, Med Ctr, Div Cardiol, Durham, NC 27710 USA