1. NICU, 3rd Department of Pediatrics, National and Kapodistrian University of Athens, Athens, Greece
2. Centre of Perinatal and Reproductive Medicine, University of Perugia, Perugia, Italy
3. Permanent International and European School of Perinatal and Reproductive Medicine, Florence, Italy
4. Department of Obstetrics and Gynecology, The I. M. Sechenov First State University of Moscow, Moscow, Russia