Prevalence of respiratory syncytial virus infection in Italian infants hospitalized for acute lower respiratory tract infections, and association between respiratory syncytial virus infection risk factors and disease severity. - Lanari,M.; Giovannini,M.; Giuffre,L.; Marini,A.; Rondini,G.; Rossi,GA.; Merolla,R.; Zuccotti,GV.; Salvioli,GP. (Pediatr Pulmonol, 2002)