[1] Dr Bernard Verbeeten Inst, NL-5000 LA Tilburg, Netherlands
[2] Univ Groningen Hosp, Groningen, Netherlands
[3] Daniel Hoed Klin, Rotterdam, Netherlands
[4] Univ Med Ctr, Utrecht, Netherlands
[5] Atrium Med Ctr, Heerlen, Netherlands
[6] Univ Med Ctr, Leiden, Netherlands
[7] Rigshosp, DK-2100 Copenhagen, Denmark
[8] Inst Bergonie, Bordeaux, France
[9] Univ Hosp Gasthuisberg, B-3000 Louvain, Belgium
[10] European Organizat Res & Treatment Canc Data Ctr, Brussels, Belgium