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Tilden EL, Phillippi JC, Carlson N, Dissanayake M, Lee CS, Caughey AB, Snowden JM.Tilden EL, et al.Birth. 2020 Dec;47(4):418-429. doi: 10.1111/birt.12494. Epub 2020 Jul 20.Birth. 2020.PMID: 32687226Free PMC article.
Tilden EL, Lee VR, Allen AJ, Griffin EE, Caughey AB.Tilden EL, et al.Birth. 2015 Sep;42(3):219-26. doi: 10.1111/birt.12179. Epub 2015 Jun 22.Birth. 2015.PMID: 26095829