1. Lund University, Skåne University Hospital; Department of Paediatrics; Lund Sweden
2. Skåne University Hospital; Cochrane Sweden; Wigerthuset, Remissgatan 4, first floor room 11-221 Lund Sweden 22185
3. Regional Center of Pharmacovigilance of Liguria Region, A.Li.Sa.; Genoa Italy
4. National Maternity Hospital; Department of Neonatology; Holles Street Dublin 2 Ireland
5. Istituto Giannina Gaslini; Epidemiology, Biostatistics Unit, IRCCS; Genoa Italy 16147