P. Kerdtawee, P. Wuttikonsammakit, and P. Chamnan, “Efficacy of Intravenous Sedation, Paracervical Block and Paracervical Block with Lidocaine Spray on Pain Relief during Uterine Curettage in First Trimester Incomplete Abortion: Randomized clinical trial”, Thai J Obstet Gynaecol, vol. 27, no. 3, pp. 139–148, Jul. 2019.