Kasim Ulusoy, Ersin. “Declined Vitamin D May Be a Trigger for Hemifacial Spasm”. Annals of Medical Research 25, no. 4 (May 25, 2021): 0525–0529. Accessed May 19, 2024. http://www.annalsmedres.org/index.php/aomr/article/view/1163.