[1] Johns Hopkins Univ, Sch Med, Johns Hopkins Bayview Med Ctr, Div Cardiol, Baltimore, MD 21224 USA
[2] Univ Calif Los Angeles, Los Angeles, CA USA
[3] Univ Lleida, Lleida, Spain
[4] Technion Israel Inst Technol, IL-32000 Haifa, Israel
[5] Columbia Univ, New York, NY USA
[6] Univ Alabama Birmingham, Birmingham, AL USA
[7] Allegheny Singer Res Inst, Pittsburgh, PA 15212 USA
[8] NHLBI, NIH, Bethesda, MD 20892 USA
[9] CALTECH, Pasadena, CA 91125 USA
[10] Palo Alto Med Fdn, Palo Alto, CA USA
[11] Univ Vermont, Burlington, VT USA
[12] Univ Calif San Diego, San Diego, CA 92103 USA
[13] Univ So Calif, Los Angeles, CA USA
[14] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[15] Med Univ S Carolina, Charleston, SC 29425 USA