1. Department of Paediatrics and Neonatology, University of Sassari
2. Istituto Superiore di Sanità, Rome
3. Department of Paediatrics, University of Trieste
4. Department of Paediatrics, University of Padua
5. Division of Neonatology, General Hospital, Udine
6. Department of Child Health and Neonatology, University of Cagliari
7. Neonatal Intensive Care Unit, University ‘La Sapienza’ Rome
8. Department of Paediatrics, University of Palermo
9. Department of Paediatrics, University ‘Federico II’, Naples, Italy