[1] Univ Hosp Leuven, Louvain, Belgium
[2] Univ Groningen, Groningen, Netherlands
[3] Eurotransplant Int Fdn, Leiden, Netherlands
[4] Univ Hosp Essen, Essen, Germany
[5] CHU Sart Tilman, Luik, Belgium
[6] Univ Hosp Maastricht, Maastricht, Netherlands