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The association between hospital obstetrical volume and mat..:

Kyser, Kathy L. ; Lu, Xin ; Santillan, Donna A....
American Journal of Obstetrics and Gynecology.  207 (2012)  1 - p. 42.e1-42.e17 , 2012
Link: https://doi.org/10.1016/j.ajog.2012.05.010