Korsuwan, P., and B. Wiriyasirivaj. “Lidocaine Spray for Pain Control during Office-based Endometrial Biopsy: A randomized placebo-controlled trial”. Thai Journal of Obstetrics and Gynaecology, vol. 26, no. 4, Dec. 2018, pp. 262-9, doi:10.14456/tjog.2018.31.