1. “P. & A. Kyriakou” Children’s Hospital, A’ Department of Pediatrics, Athens, Greece

2. “P. & A. Kyriakou” Children’s Hospital, Department of Oncology, Athens, Greece

3. “Evangelismos” General Hospital, Department of Histopathology and Molecular Pathology, Athens, Greece

4. Saint Savvas Anticancer Oncological Hospital of Athens, Department of Radiology, Unit of Sonography, Athens, Greece

5. University of Patras Medical School, Department of Pediatrics, Division of Endocrinology, Patras, Greece