Jamshidian-Tehrani, M., H. Z. Mehrjardi, A. Kasaee, and S. Yadegari. “Ptosis Following Botulinum Toxin Injection in Hemifacial Spasm: Not Always a Straightforward Diagnosis”. Current Journal of Neurology, Vol. 18, no. 4, Nov. 2019, pp. 184-6, doi:10.18502/ijnl.v18i4.2192.