[1] Hannover Med Sch, Hannover, Germany
[2] Charite, Berlin, Germany
[3] Hosp 12 Octubre, Madrid, Spain
[4] Univ Hosp Nantes, Nantes, France
[5] Med Univ Vienna, Vienna, Austria
[6] Baylor Univ, Med Ctr, Waco, TX 76798 USA
[7] Bristol Myers Squibb Co, New York, NY 10154 USA
[8] Univ Calif San Francisco, Transplant Ctr, San Francisco, CA 94143 USA