1. Department of Child Psychiatry, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children’s Hospital, Athens, Greece
2. Department of Child and Adolescent Psychiatry, Sismanoglio General Hospital of Attica, Athens, Greece
3. Department of Child and Adolescent Psychiatry, Hippokratio Hospital of Thessaloniki, Greece
4. Department of Hygiene, Epidemiology and Medical Statistics, National and Kapodistrian University of Athens, Athens, Greece
5. 1st Department of Psychiatry, Child Guidance Unit of Mental Health Center Vyrona- Kaisarianis, Medical School, National and Kapodistrian University of Athens, Athens, Greece