1. Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
2. Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
3. Italian Primary Care Paediatrics Society (SICuPP), 20126 Milan, Italy
4. Pediatric Emergency Units, Fondazione Ca’ Granda Policlinico di Milano, 20122 Milan, Italy
5. Pediatric Infectious Disease Units, Fondazione Ca’ Granda Policlinico di Milano, 20122 Milan, Italy
6. Department of Biomedical Sciences for Health, University of Milan, 20133 Milan, Italy
7. Quality Units, Fondazione Ca’ Granda Policlinico di Milano, 20122 Milan, Italy