1. Department of Paediatrics; Medical University of Warsaw; Warsaw Poland
2. Department of Internal Medicine; General University Hospital of Patras; Patras Greece
3. Paediatrics, Department of Clinical Sciences Lund; Lund University, Skåne University Hospital; Lund Sweden
4. Epidemiology and Biostatistics Unit, Scientific Directorate; IRCCS Istituto Giannina Gaslini; Genova Italy
5. Center for Health Regulatory Policies; Mario Negri Institute for Pharmacological Research IRCCS; Milan Italy
6. Department of Clinical Sciences Lund, Paediatrics; Lund University, Skåne University Hospital; Lund Sweden
7. Cochrane Sweden, Department of Research and Education; Lund University, Skåne University Hospital; Lund Sweden