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. Author manuscript; available in PMC: 2019 Mar 15.
Published in final edited form as: Am J Perinatol. 2017 Oct 27;35(4):380–384. doi: 10.1055/s-0037-1607317

Fig. 1.

Fig. 1

Study cohort. This figure depicts the inclusion and exclusion criteria and process for selection of the study cohort. FTB, full-term birth; sPTB, spontaneous preterm birth.