[1] Oregon Hlth & Sci Univ, Knight Cardiovasc Inst, Div Cardiol, Portland, OR USA
[2] Portland VA Med Ctr, Div Cardiol, Portland, OR USA
[3] Oregon Hlth & Sci Univ, Knight Cardiovasc Inst, Div Cardiol, 3181 SW Sam Jackson Pk Rd,UHN62, Portland, OR 97239 USA