Prospective Randomized Split-Face Comparative Study Between Topical Botulinum Toxin A Surface Application and Local Injection for Crow's Feet.
Mahmoud BH, Ozog D, Burnett C, Cohen JL. Prospective Randomized Split-Face Comparative Study Between Topical Botulinum Toxin A Surface Application and Local Injection for Crow's Feet. Dermatol Surg. 2016 Apr; 42(4):554-6.