1. Department of Pediatrics, St Anna Children's Hospital, Medical University Vienna, Vienna, Austria
2. Children's Cancer Research Institute, Vienna, Austria
3. Department of Oncology, Yerevan State Medical University, Yerevan, Armenia
4. Clinic of Chemotherapy, Muratsan Hospital Complex of Yerevan State Medical University, Yerevan, Armenia
5. Klinikum Stuttgart, Olgahospital, Pediatrics 5 – Oncology, Hematology, Immunology, Stuttgart, Germany