中国医学创新  2015, Vol. 12 Issue (05): 34-37    DOI: 10.3969/j.issn.1674-4985.2015.05.011
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Effect Observation of Two Kinds Expulsion of Fetus on Maternal Perineal Injury
Women & Children’s Hospital of Heyuan City,Heyuan 517000,China
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