Eric C T Geijteman1, Frank H Bosch2, Yvo M Smulders3. 1. Erasmus MC Cancer Institute, Rotterdam, the Netherlands (E.C.G.). 2. Radboudumc and Rijnstate Hospital, Nijmegen and Arnhem, the Netherlands (F.H.B.). 3. Amsterdam University Medical Center, Amsterdam, the Netherlands (Y.M.S.).