2 Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana" Pediatric Section, University of Salerno, Baronissi, SA, Italy.
3 Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana" Pediatric Section, University of Salerno, Baronissi, SA, Italy. Electronic address: pvajro@unisa.it.