Author contributions
YML participated in field investigation, data collection, and drafting of the manuscript. HYH participated in the design of the study and field investigation and data collection. JXW, YFC, CYW, XYL, and AQD participated in field investigation and data collection. YL participated data analysis. YF, XX, JH, MZ, MFZ, and PY participated in the design of the study. XL and LLY participated in the design of the study, field investigation, data collection, and review of the manuscript. All authors saw and approved the final version.We thanked all women who took the time to participate in this study.