american journal of obstetrics
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american journal of obstetrics and gynecology
american journal of obstetrics & gynecology
american journal of obstetrics gynecology mfm
american journal of obstetrics mfm
american journal of obstetrics impact factor
american journal of obstetrics gynecology
2018 american journal of obstetrics
american journal of obstetrics and gynecology, american journal of obstetrics & gynecology, american journal of obstetrics gynecology mfm, american journal of obstetrics mfm, american journal of obstetrics impact factor, american journal of obstetrics gynecology, 2018 american journal of obstetrics