1 4th Department of Pediatrics, Papageorgiou General Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece. gkiourtzisnikolaos@gmail.com.
2 Saint Luke's Private Clinic, Thessaloniki, Greece. gkiourtzisnikolaos@gmail.com.
3 Saint Luke's Private Clinic, Thessaloniki, Greece.
4 4th Department of Pediatrics, Papageorgiou General Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.