Poungvarin, N., Y. Nilanont, N. Prayoonwiwat, and V. Senanarong. “Hemifacial Spasm Treated with Botulinum Toxin Injection : A Ten-Year Experience at Siriraj Hospital”. Siriraj Medical Journal, vol. 53, no. 1, Aug. 2020, pp. 1-7, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/244019.