[1] Leiden Univ, Med Ctr, Leiden, Netherlands
[2] Univ Hosp Gasthuisberg, B-3000 Louvain, Belgium
[3] Inst Gustave Roussy, Villejuif, France
[4] Erasmus Med Ctr, Rotterdam, Netherlands
[5] Hop St Louis, Paris, France
[6] Hop Henri Mondor, F-94010 Creteil, France
[7] Ctr Hosp Reg & Univ Lille, F-59037 Lille, France
[8] Inst Bergonie, Bordeaux, France
[9] Ctr Reg Francois Baclesse, Caen, France