Kerdtawee, P., 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 Journal of Obstetrics and Gynaecology, vol. 27, no. 3, July 2019, pp. 139-48, doi:10.14456/tjog.2019.18.