[1] Univ Calif Los Angeles, Los Angeles, CA USA
[2] Mayo Clin, Rochester, MN USA
[3] Indiana Univ, Indianapolis, IN 46204 USA
[4] St Vincent Heart & Vasc, Billings, MT USA
[5] Univ Florida, Gainesville, FL USA
[6] Stanford Univ, Stanford, CA 94305 USA
[7] Methodist Hosp, Houston, TX 77030 USA
[8] Univ Calif Davis, Davis, CA 95616 USA
[9] Washington Univ, St Louis, MO USA
[10] Indiana Ohio Heart, Indianapolis, IN USA
[11] Baylor Univ, Houston, TX 77030 USA
[12] William Beaumont Hosp, Royal Oak, MI 48072 USA
[13] St Louis Univ, St Louis, MO 63103 USA
[14] Advocate Lutheran Gen Hosp, Niles, IL USA