1. Department of Paediatrics, Medical School, University of Crete, Crete, Greece,
2. Biostatistic Laboratory, University of Crete, Heraklion, Crete, Greece
3. Department of Paediatrics, Medical School, University of Crete, Crete, Greece
4. Department of Neurology, Medical School, University of Crete, Crete, Greece
5. Institute of Child Health, Children's Hospital Agia Sofia, Athens, Greece
6. Center of Mental Health, Heraklion, Crete, Greece
7. Center of Mental Health, Chania, Crete, Greece
8. Second Department of Pediatrics, University of Athens, Athens, Greece
9. Department of Ear, Nose and Throat, Medical School, University of Crete, Crete, Greece
10. Department of Pediatrics, University Hospital Nijmegen, Nijmegen, The Netherlands