[1] ISPED, Canc Axis, INSERM, U897, Bordeaux, France
[2] European Org Res & Treatment Canc Stat Dept, Brussels, Belgium
[3] Ctr Oscar Lambret, Dept Gen Oncol, F-59020 Lille, France
[4] ISPED, Biostat Unit, INSERM, U897, Bordeaux, France
[5] Hasselt Univ, Ctr Stat, Diepenbeek, Belgium
[6] Inst Bergonie, Dept Med Oncol, Bordeaux, France
[7] CLCC Inst Bergonie, Bordeaux, France