Chaiwongsa, Trinya, and Jittima Rujiwetpongstorn. 2020. “The Association between Anterior Uterocervical Angle and Pregnancy between 16-24 Weeks of Gestation”. Thai Journal of Obstetrics and Gynaecology 28 (1). Bangkok, Thailand:44-51. https://doi.org/10.14456/tjog.2020.6.