1. Oncology Department, “P & A. Kyriakou” Children's Hospital, Thivon & Levadias, 11527 Athens, Greece
2. Second Department of Pediatrics, National and Kapodistrian University of Athens School of Medicine, “P & A. Kyriakou” Children's Hospital, Athens, Greece
3. Pathology Lab of “P & A. Kyriakou” Children's Hospital, Thivon & Levadias, 11527 Athens, Greece