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Brazilian multicenter study on prevalence of preterm birth and associated factors

Renato Passini*, Ricardo P Tedesco, Sergio T Marba, Jose G Cecatti, Ruth Guinsburg, Francisco E Martinez, Marcelo L Nomura and the Brazilian Network of Studies on Reproductive and Perinatal Health

BMC Pregnancy and Childbirth 2010, 10:22  doi:10.1186/1471-2393-10-22

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