1. Cooperative Osteosarcoma Study Group, Pediatrics 5 (Oncology, Hematology, Immunology), Center for Pediatric, Adolescent and Women’s Medicine, Stuttgart Cancer Center, Klinikum Stuttgart—Olgahospital, 70174 Stuttgart, Germany
2. Klinik für Kinder- und Jugendmedizin, Pädiatrische Hämatologie und Onkologie, Universitätsklinikum Münster, 48149 Münster, Germany
3. St. Anna Kinderspital, University Hospital for Pediatric and Adolescent Medicine of the Medical University, and St. Anna Children’s Cancer Research Institute (CCRI), 1090 Vienna, Austria
4. Department of Pediatric Oncology/Hematology, Pediatric University Hospital Basel, CH-4031 Basel, Switzerland
5. Hospital for Pediatric and Adolesent Medicine, Pediatric Hematology and Oncology, Rheumatology and Immunology, Universitity Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany
6. Onkologie und Palliativmedizin, Helios Klinikum Berlin-Buch, 13125 Berlin, Germany