[1] Hannover Med Sch, Hannover, Germany
[2] Univ Hosp Leuven, Louvain, Belgium
[3] Strasbourg Univ Hosp, Strasbourg, France
[4] Hosp Univ Padova, Padua, Italy
[5] St Josephs Med Ctr, Phoenix, AZ USA
[6] UCSF Med Ctr, San Francisco, CA USA
[7] Harefield Hosp, London, England
[8] St Vincents Hosp, Sydney, NSW 2010, Australia
[9] Univ Alberta, Med Ctr, Edmonton, AB, Canada
[10] Univ Hosp Puerta de Hierro, Madrid, Spain
[11] UPMC Med Ctr, Pittsburgh, PA USA
[12] Papworth Hosp, Cambridge CB3 8RE, England
[13] Hop Xavier Bichat, Paris, France
[14] German Heart Inst, Berlin, Germany
[15] Cleveland Clin Fdn, Cleveland, OH 44195 USA
[16] Hosp Univ Marseille, Marseille, France
[17] Univ Minnesota, Minneapolis, MN USA
[18] Massachusetts Gen Hosp, Boston, MA 02114 USA
[19] Indiana Univ, Med Ctr, Indianapolis, IN USA
[20] Univ Minnesota, Minneapolis, MN USA
[21] UCLA Med Ctr, Los Angeles, CA USA