Hospital-based surveillance to evaluate the impact of rotavirus vaccination in São Paulo, Brazil - Sáfadi, Marco Aurélio Palazzi; Berezin, Eitan Naaman; Munford, Veridiana; Almeida, Flavia Jaqueline; Moraes, José Cássio de; Pinheiro, Cid Fernando; Racz, Maria Lúcia Barbosa de Oliveira (Pediatric Infectious Disease Journal, 2010)