[1] Charite, D-13353 Berlin, Germany
[2] Univ Krankenhaus Eppendorf, Hamburg, Germany
[3] UCL St Luc, Brussels, Belgium
[4] Ghent Univ Hosp, Ghent, Belgium
[5] Hosp Clin Barcelona, Barcelona, Spain
[6] Hop Rangueil, CHU Toulouse, Toulouse, France
[7] INSERM, Unite 785, F-75654 Paris 13, France
[8] Univ Paris 11, UMR S785, Villejuif, France
[9] Azienda Osped Padova, Padua, Italy