Poopaibool, N., Bumrungphuet, S., & Israngura Na Ayudhya, N. (2018). Estimating the Date of Confinement: A 3-year retrospective study in Ramathibodi Hospital. Thai Journal of Obstetrics and Gynaecology, 26(3), 166–174. https://doi.org/10.14456/tjog.2018.20