Key points are not available for this paper at this time.
May inform hypothesis generation in obstetrics; leaves open need for prospective validation before any practice consideration.
Department of Obstetrics and Gynecology, Kaiser Foundation Hospital, Oakland, California Division of Research Kaiser Permanente Northern California, Oakland, California Financial Disclosure: The authors did not report any potential conflicts of interest.
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Walton et al. (2013) studied this question.
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