1. University of Ljubljana, Faculty of Medicine , Vrazov trg 2, 1000 Ljubljana , Slovenia
2. University of Zagreb, School of Medicine , Šalata ulica 2, 10000 Zagreb , Croatia
3. Rho Sigma Research & Statistics , Topniška ulica 45, 1000 Ljubljana , Slovenia
4. School of Publich Health Andrija Štamparja, School of Medicine , Šalata ulica 2, 10000 Zagreb , Croatia
5. University Medical Centre Ljubljana, Division of Obstetrics and Gynecology Department of Perinatology, Neonatal Intensive Care Unit , Šlajmerjeva ulica 3, 1000 Ljubljana , Slovenia
6. Divison of Surgical Services, Department of Pediatric surgery and Intensive Therapy, Pediatric Intensive Care Unit , Bohoričeva ulica 20, 1000 Ljubljana , Slovenia
7. University of Ljubljana, Faculty of Medicine, Department of Pediatrics , Vrazov trg 2, 1000 Ljubljana , Slovenia