DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Zhang YP, Liu XH, Gao SH, Wang JM, Gu YS, Zhang JY. , et al.
Risk factors for preterm birth in five Maternal and Child Health hospitals in Beijing.
PLoS One 2012;
7 (12) e52780 . Doi: 10.1371/journal.pone.0052780
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