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Comment
. 2017 Aug 28;189(34):E1096.
doi: 10.1503/cmaj.733261.

Beware selection bias

Jon F R Barrett  1 , Arthur Zaltz  2 , Michael Geary  3 , Mathew Sermer  4 , John Kingdom  5
Affiliations
Comment

Beware selection bias

Jon F R Barrett et al. CMAJ. .
No abstract available

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Conflict of interest statement

Competing interests: None declared.

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References

    1. Muraca GM, Sabr Y, Lisonkova S, et al. Perinatal and maternal morbidity and mortality after attempted operative vaginal delivery at midpelvic station. CMAJ 2017;189:E764–72. - PMC - PubMed
    1. Gossett DR, Gilchrist-Scott D, Wayne DB, et al. Simulation training for forceps-assisted vaginal delivery and rates of maternal perineal trauma. Obstet Gynecol 2016;128:429–35. - PubMed
    1. Burke N, Field K, Mujahid F, et al. Use and safety of Kielland’s forceps in current obstetric practice. Obstet Gynecol 2012;120:766–70. - PubMed
    1. Bailit JL, Grobman WA, Rice MM, et al. Evaluation of delivery options for second-stage events. Am J Obstet Gynecol 2016;214:638.e1–10. - PMC - PubMed