Concepts of the Society of Paediatric Oncology and Haematology (GPOH) and the German Competence Network in Paediatric Oncology and Haematology for the quality controlled development in paediatric oncology. - Creutzig,U.; Jürgens,H.; Herold,R.; Göbel,U.; Henze,G. (Klin Pädiatr, 2004)