[1] Columbia Univ, Div Gen Med, Med Ctr, New York, NY 10032 USA
[2] Univ Washington, Inst Hlth Metr & Evaluat, Seattle, WA 98195 USA
[3] Vanderbilt Univ, Div Cardiovasc Med, Nashville, TN 37235 USA
[4] Cedars Sinai Med Ctr, Div Cardiol, Los Angeles, CA 90048 USA
[5] Auckland Univ Technol, Auckland, New Zealand
[6] NHLBI, NIH, Bethesda, MD 20892 USA