The burden of single virus and viral coinfections on severe lower respiratory tract infections among preterm infants: a prospective birth cohort study in Brazil - Arruda, Eurico; Jones, Marcus H.; Paula, Flavia Escremim de; Chong, Debora; Bugarin, Gabriela; Notario, Gerard; Matsuno, Alessadra K.; Pitrez, Paulo M.; Vo, Pamela; Suzuki, Claudia; Rosario Filho, Nelson; Stein, Renato T. (Pediatric Infectious Disease Journal, 2014)