1. 2nd NICU and Neonatology Department, Aristotle University of Thessaloniki, General Papageorgiou Hospital, Thessaloniki, Greece,
2. Department of Physiotherapy, Aristotle University of Thessaloniki, General Papageorgiou Hospital, Thessaloniki, Greece
3. 2nd NICU and Neonatology Department, Aristotle University of Thessaloniki, General Papageorgiou Hospital, Thessaloniki, Greece
4. 2nd Department of Pediatrics, Medical School, Aristotle University of Thessaloniki, General Papageorgiou Hospital, Thessaloniki, Greece