From the University Children's Hospital, and University of Tübingen, Department of Medical Biometry, Tübingen; University Children's Hospital, Essen; University Children's Hospital, Duesseldorf; Hannover Medical School, Children's Hospital, Hannover; University Children's Hospital, Freiburg; University Children's Hospital Charité, Berlin; University Children's Hospital, Jena; University Children's Hospital, Greifswald; University Children's Hospital, Frankfurt, Germany; St Jude Children's Research... (At 2004-05-01)