1. Department of Clinical Sciences Lund, Paediatrics; Lund University, Skåne University Hospital; Lund Sweden
2. Cochrane Sweden; Lund University, Skåne University Hospital; Lund Sweden
3. Medical Clinic; Hudiksvall Hospital; Hudiksvall Sweden
4. Center for Health Regulatory Policies; Mario Negri Institute for Pharmacological Research IRCCS; Milan Italy
5. Epidemiology, Biostatistics Unit, IRCCS; Istituto Giannina Gaslini; Genoa Italy
6. Pediatric and Neonatology Unit; Ospedale San Paolo; Savona Italy