Preconception blood pressure and risk of preterm birth: a large historical cohort study in a Chinese rural population Ying Yang, Ph.D., Yuan He, Ph.D., Qian Li, M.S., Yuanyuan Wang, Ph.D., Zuoqi Peng, M.D., Jihong Xu, Ph.D., Xu Ma, M.S. Fertility and Sterility Volume 104, Issue 1, Pages 124-130 (July 2015) DOI: 10.1016/j.fertnstert.2015.03.024 Copyright © 2015 American Society for Reproductive Medicine Terms and Conditions
Figure 1 Flowchart of participant recruitment, and derivation of the population used in the final analysis. Fertility and Sterility 2015 104, 124-130DOI: (10.1016/j.fertnstert.2015.03.024) Copyright © 2015 American Society for Reproductive Medicine Terms and Conditions