1. Leiden Univ Medcl Ctr, Leiden, The Netherlands; Univ Hosp Gasthuisberg, Leuven, Belgium; Inst Gustave Roussy, Villejuif, France; Erasmus Medcl Ctr, Rotterdam, The Netherlands; Hosp Saint-Louis, Paris, France; Hosp Henri Mondor, Creteil, France; Ctr Hospitalier Univ, Lille, France; Inst Bergonié, Bordeaux, France; Ctr Régional Francois Baclesse, Caen, France