4th Department of Pediatrics, Papageorgiou General Hospital, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece. Department of Pediatrics, Faculty of Medicine, Democritus University of Thrace, 6th Kilometer Alexandroupolis-Makris, 68 100, Alexandroupolis, Thrace, Greece. Department of Pediatrics, Faculty of Medicine, University of Ioannina, Ioannina, Greece. 2nd Department of Pediatrics, AHEPA University Hospital, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece. Department of Pediatrics, Faculty of Medicine, Democritus University of Thrace, 6th Kilometer Alexandroupolis-Makris, 68 100, Alexandroupolis, Thrace, Greece. emantada@med.duth.gr.