1 Department of Child Psychiatry, General Pediatric Hospital of Athens "Aghia Sophia", Medical School, National and Kapodistrian University of Athens, Thivon & Papadiamantopoulou, 115 25, Athens, Greece.
2 Department of Child Psychiatry, General Pediatric Hospital of Athens "Aghia Sophia", Medical School, National and Kapodistrian University of Athens, Thivon & Papadiamantopoulou, 115 25, Athens, Greece. ggiannak@med.uoa.gr.