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Second-stage labor duration in nulliparous women: relations..:

Rouse, Dwight J. ; Weiner, Steven J. ; Bloom, Steven L....
American Journal of Obstetrics and Gynecology.  201 (2009)  4 - p. 357.e1-357.e7 , 2009
Link: https://doi.org/10.1016/j.ajog.2009.08.003