[1] Univ Hosp Gasthuisberg, B-3000 Louvain, Belgium
[2] Natl Inst Oncol, Budapest, Hungary
[3] Imelda Ziekenhuis, Bonheiden, Belgium
[4] NN Petrov Res Inst Oncol Biotherapy & Bone Marrow, St Petersburg, Russia
[5] Wielkopolskie Ctr Onkol, Poznan, Poland
[6] Univ Hosp Carl Gustav Carus Dresden, Dresden, Germany
[7] Univ Hosp Gasthuiberg, Louvain, Belgium
[8] Merck Serono, Frankfurt, Germany
[9] Merck Serono, Darmstadt, Germany