[1] Spectrum Hlth, Frederik Meijer Heart & Vasc Inst, Grand Rapids, MI USA
[2] Univ Washington, Med Ctr, Seattle, WA 98195 USA
[3] Columbia Univ, Med Ctr, NewYork Presbyterian Hosp, New York, NY USA
[4] Piedmont Heart Inst, Atlanta, GA USA
[5] Univ Missouri, Kansas City, MO 64110 USA
[6] Mid Amer Heart Inst, Kansas City, MO USA
[7] Duke Univ, Med Ctr, Durham, NC USA