1. Department of Internal Medicine, University of Pavia, 27100 Pavia, Italy
2. Department of Pediatrics, IRCCS Policlinico S. Matteo Foundation, 27100 Pavia, Italy
3. IRCCS C. Mondino Foundation and University of Pavia, 27100 Pavia, Italy
4. Pediatric and Infectious Disease Unit, Department of Pediatrics, Bambino Gesù Children’s Hospital, 00165 Rome, Italy