1. Package insert on BOTOX®/BOTOX®Cosmetic. Allergan, Inc. Irvine, CA; revised July, 2020.
2. Package insert on DYSPORT®. Galderma Laboratories, L.P., Fort Worth, TX; revised July, 2020.
3. Package insert on XEOMIN®. Merz Pharma, GmbH&Co KGaA, Am Pharmapark, D-06861, Dessal-RossLau, Germany; revised May, 2019.
4. Package insert on JEUVEAU™. Evolus Inc., Santa Barbara, CA; February, 2019.
5. Janis JE, Ghavanni A, Lemmon JA, et al. Anatomy of the corrugator supercilii muscle: part 1. Corrugator topography. Plast Reconstr Surg. 2007;120:1647–53.