[1] LUMC, Leiden, Netherlands
[2] Netherlands Canc Inst, Amsterdam, Netherlands
[3] UZ Gasthuisberg, Louvain, Belgium
[4] Gustave Roussy, Villejuif, France
[5] Eortc Data Ctr, Brussels, Belgium
[6] Med Spectrum Twente, Enschede, Netherlands
[7] UMCG, Groningen, Netherlands