1. Dipartimento di Ematologia ed Oncologia, Azienda ospedaliera Città della Salute e della Scienza di Torino, Torino, Italy
2. Department of Gynecology and Obstetrics, University Hospital Essen, University Duisburg-Essen, Essen, Germany
3. Department of Neonatology, Clinic for Pediatrics I, University Hospital Essen, University Duisburg-Essen, Essen, Germany
4. Department of Neuropediatrics, Developmental Neurology and Social Pediatrics, Clinic for Pediatrics I, University Hospital Essen, University Duisburg-Essen, Essen, Germany
5. Hematology/Oncology Group Practice, Koblenz, Germany
6. Department of Medical Oncology, West German Cancer Center, University Hospital Essen, University Duisburg-Essen, Essen, Germany