DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Gottvall K, Allebeck P, Ekéus C.
Risk factors for anal sphincter tears: the importance of maternal position at birth.
BJOG 2007;
114 (10) 1266-1272
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