1. Department of Woman and Child Health Versilia Hospital Viareggio Italy
2. Department of Fetal‐Neonatal Medicine Anna Meyer Children's University Hospital Florence Italy
3. Health Agency of Tuscany Florence Italy
4. Department of Gynecology, Perinatology and Human Reproduction Careggi University Hospital Florence Italy
5. Department of Neuroscience, Psychology, Drug Research and Child Health Careggi University Hospital Florence Italy
6. Department of Pediatrics Division of Neonatology and Neonatal Intensive Care Unit University Hospital of Pisa Pisa Italy
7. Neonatal Intensive Care Unit University Hospital of Siena Siena Italy
8. Unit of Epidemiology Anna Meyer Children's University Hospital Florence Italy