1. National and Kapodistrian University of Athens, Medical School, Athens, Greece
2. Experimental Research Centre, ELPEN Pharmaceuticals, Athens, Greece
3. Puericulture Institute and Neonatal Section, Department of Clinical Medicine and Pediatric Sciences, Neonatal Intensive Care Unit, University of Cagliari, Cagliari, Italy
4. 2nd Department of Obstetrics and Gynecology, Neonatal Division, Aretaieio Hospital Medical School, National and Kapodistrian University of Athens, Greece