[1] Washington Hosp Ctr, Medstar Heart Inst, Washington, DC 20010 USA
[2] Vall dHebron Univ Hosp, Barcelona, Spain
[3] Univ Texas SW Med Ctr Dallas, Dallas, TX 75390 USA
[4] Natl Inst Hlth, Bethesda, MD USA
[5] Univ Padua, Padua, Italy
[6] Cleveland Clin, Cleveland, OH 44106 USA
[7] Mayo Clin, Rochester, MN USA
[8] Univ Zurich Hosp, CH-8091 Zurich, Switzerland
[9] Weill Cornell Med Coll, New York, NY USA
[10] Univ Duisburg Essen, West German Heart Ctr, Essen, Germany
[11] San Salvatore Hosp, Pesaro, Italy
[12] Massachusetts Gen Hosp, Boston, MA 02114 USA
[13] Methodist DeBakey Heart & Vasc Ctr, Houston, TX USA
[14] Univ Rostock, D-18055 Rostock, Germany
[15] IRCCS, Ctr Cardiol Monzino, Milan, Italy
[16] Univ Hosp Ramon y Cajal, Madrid, Spain
[17] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[18] Univ Michigan, Ann Arbor, MI 48109 USA
[19] Yale Univ, Sch Med, New Haven, CT USA
[20] Hop Bichat Claude Bernard, F-75877 Paris, France
[21] Hop Rangueil, Toulouse, France
[22] AZ St Jan Brugge, Brugge, Belgium