1. Department of Pathophysiology and Transplantation, University of Milan and Fondazione IRCCS, Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
2. Department of Pediatrics, University of Texas Medical Branch at Galveston, Galveston, Texas, USA
3. Pediatric Emergency Medicine Department, Soroka University Medical Center, Ben-Gurion University, Beer-Sheva, Israel
4. Southern California Permanente Medical Group, Panorama City, California, USA
5. Research Unit of General Practice, Institute of Public Health, University of Southern Denmark, Odense, Denmark
6. Department of Otolaryngology, Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
7. The Menzies School of Health Research, Darwin, Northern Territory, Australia
8. Department of Pediatrics, Turku University hospital, Turku, Finland