Thakkinstian, A., Srimanoi, M., & Suthatvoravut, S. (1999). Prediction of Time to Delivery: Elective Induction Versus Spontaneous Labor. Thai Journal of Obstetrics and Gynaecology, 11(4), 217. retrieved from https://he02.tci-thaijo.org/index.php/tjog/article/view/95030