1. Second Department of Paediatrics, National and Kapodistrian University of Athens, “P. and A. Kyriakou” Children’s Hospital, Athens
2. Third Department of Paediatrics, Aristotle University of Thessaloniki, Hippokration General Hospital, Thessaloniki
3. First Department of Paediatrics, National and Kapodistrian University of Athens, “Aghia Sophia” Children’s Hospital, Athens
4. Department of Pediatrics, Patras Medical School, University General Hospital of Patras, Patras
5. Paediatric Department, Pentelis Children’s Hospital, Athens
6. Fourth Department of Paediatrics, Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki
7. Paediatric Department, “George Gennimatas” General Hospital, Thessaloniki
8. Third Department of Paediatrics, National and Kapodistrian University of Athens, General University Hospital “Attikon,” Athens
9. Department of Paediatrics, Medical School, University of Crete, Heraklion
10. First Department of Paediatrics, Aristotle University of Thessaloniki, Hippokration General Hospital, Thessaloniki
11. Department of Paediatrics, Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece.