1. Infectious Diseases, Children’s Hospital Giovanni XXIII, A.O.U.C. Policlinico di Bari, Bari, Italy
2. Department of Pediatrics, S.Spirito Hospital, U.O.C. Pediatria A.S.L. Pescara, Pescara, Italy
3. Department of Life, Health and Environmental Sciences, Università dell’Aquila, L'Aquila, Italy
4. Interdisciplinary Department of Medicine, Aldo Moro University of Bari, Bari, Italy