[1] Free Univ Amsterdam Hosp, Div Oncol, NL-1081 HV Amsterdam, Netherlands
[2] Netherlands Canc Inst, Amsterdam, Netherlands
[3] Univ Hosp Dijkzigt, NL-3015 GD Rotterdam, Netherlands
[4] Radboud Hosp, Nijmegen, Netherlands
[5] European Org Res Treatment Canc, Ctr Data, Brussels, Belgium
[6] Univ Antwerp Hosp, Antwerp, Belgium
[7] Hosp 12 Octubre, E-28041 Madrid, Spain
[8] Osped S Luigi, Orbassano, Italy
[9] Ist Nazl Ric Canc, I-16132 Genoa, Italy