1. Pulmonology and Allergology Section; Pediatrics Unit; Pisa University Hospital; Pisa Italy
2. Retrovirus Center and Virology Section, Department of Translational Research and New Technologies in Medicine and Surgery; University of Pisa; Pisa Italy
3. Virology Unit; Pisa University Hospital; Pisa Italy
4. CINTESIS-Center for Health Technology and Services Research, Faculty of Medicine; University of Porto; Porto Portugal
5. Department of Cardiovascular and Respiratory Sciences; Porto Health School; Porto Portugal
6. Pediatrics and Neonatology Division, Women's and Children's Health Department; Versilia Hospital; Lido di Camaiore Italy