N. Mapaisankit, P. Chandeying, and S. Tangthasana, “Efficacy of Ethyl Chloride Spray versus Subcutaneous 1% Lidocaine Injection for Relieving the Pain of One-rod Contraceptive Implant Removal: A single-blinded randomized controlled trial”, Thai J Obstet Gynaecol, vol. 29, no. 2, pp. 82–91, Mar. 2021.