[1] Harvard Med Sch, Brigham & Womens Hosp, Boston, MA 02115 USA
[2] Henry Ford Hosp, Detroit, MI 48202 USA
[3] Manchester Univ Fdn Trust, Manchester, Lancs, England
[4] Mayo Clin, Rochester, MN USA
[5] Mt Sinai, New York, NY USA
[6] Columbia Univ, Med Ctr, New York, NY USA
[7] New York Presbyterian Hosp, New York, NY USA
[8] Washington Univ, St Louis, MO USA
[9] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[10] Houston Methodist Hosp, Houston, TX USA
[11] Weill Cornell Med Coll, Houston, TX USA
[12] Harvard Med Sch, Boston, MA USA
[13] Rhode Isl Hosp, Providence, RI USA
[14] Cedars Sinai, Los Angeles, CA USA
[15] St Lukes Mid Amer Heart Inst, Kansas City, MO USA
[16] Univ Ottawa Heart Inst, Ottawa, ON, Canada