Charoenniwetnukul, Vipa, Boonsri Chanrachakul, Yongyoth Herabutya, and Nathpong Israngura Na Ayudhya. 2017. “Single Oral Dose Ibuprofen for Pain Relief in Fractional Curettage under Paracervical Block: A Double-Blind Randomized Controlled Trial”. Thai Journal of Obstetrics and Gynaecology 15 (1). Bangkok, Thailand:15-20. https://he02.tci-thaijo.org/index.php/tjog/article/view/82773.