[1] CHR Grenoble La Tronche, Grenoble, France
[2] Univ Hosp Gasthuisberg, B-3000 Louvain, Belgium
[3] Hop St Luc, Brussels, Belgium
[4] Virga Jesse Ziekenhuis, Hasselt, Belgium
[5] Univ Milan, Osped San Raffaele, I-20127 Milan, Italy
[6] EORTC, Brussels, Belgium