Affiliation: | (1) The Children's Hospital, Department of Pediatric Cardiology, Medical School of Hannover, Konstanty-Gutschow-Str., D-3000 Hannover 61, Federal Republic of Germany;(2) Department of Pediatric Oncology, The Children's Hospital, Medical School of Hannover, D-3000 Hannover, Federal Republic of Germany;(3) Children's Hospital of Herford, D-4900 Herford, Federal Republic of Germany |