Much has been published regarding rejuvenation of the upper face with botulinum toxin A injection; however, the optimal target tissue layer has not been specifically examined.
To seek a difference between subcutaneous (SC) and intramuscular (IM) administration.
Design, Setting, and Participants
Prospective, randomized ...
JAMA Facial Plast Surg. Published online April 03, 2014. doi:10.1001/jamafacial.2013.2458