A. Yahya, H. Umaru‑Sule, A. M. Umar, H. M. Muhammad, and P. O. Ibinaiye, “Effect of topical xylocaine for pain relief during hysterosalpingography among infertile women in Zaria, Nigeria: A randomized controlled trial”, WAJR, vol. 28, no. 1, pp. 8–14, Jun. 2021, doi: 10.4103/wajr.wajr_9_20.