1. Neonatal Intensive Care Unit, 3rd Department of Pediatrics National and Kapodistrian University of Athens Athens Greece
2. Department of Obstetrics, Gynecology and Reproductive Sciences University of California San Francisco CA USA
3. Department of Obstetrics and Gynecology, Centre for Perinatal and Reproductive Medicine University of Perugia Perugia Italy
4. Department of Obstetrics and Gynecology IM Sechenov First State University Moscow Russia