1. Department of Pediatric Hematology- Oncology, Agia Sofia Children's Hospital, Athens, Greece
2. Department of Haematology, National and Kapodistrian University of Athens, School of Medicine, Laikon General Hospital, Athens, Greece
3. Second Department of Surgery, Propedeutic, National and Kapodistrian University of Athens, School of Medicine, Laikon General Hospital, Athens, Greece
4. Department of Nuclear Medicine, HYGEIA Hospital, Athens, Greece
5. Department of Nuclear Medicine and PET/CT, Evangelismos General Hospital, Athens, Greece
6. Department of Pediatric Cardiac Surgery, Agia Sofia Children's Hospital, Athens, Greece
7. Department of Hematology, Athens Medical Center, Athens, Greece