Treatment of nasopharyngeal carcinoma in children and adolescents: definitive results of a multicenter study (NPC-91-GPOH). - Mertens,R.; Granzen,B.; Lassay,L.; Bucsky,P.; Hundgen,M.; Stetter,G.; Heimann,G.; Weiss,C.; Hess,CF.; Gademann,G. (Cancer., 2005)