A Randomized, Blinded, Prospective Clinical Study Comparing Small-Particle Versus Cohesive Polydensified Matrix Hyaluronic Acid Fillers for the Treatment of Perioral Rhytids

Dr Polacco is a facial plastic surgery fellow and Dr Maas is a facial plastic surgeon at a private facial plastic surgery practice in San Francisco, CA.

Dr Singleton is a facial plastic surgeon in private practice in Chevy Chase, MD.

Mrs Luu is a Research and Medical Assistant, University of California San Francisco, San Francisco, CA

Corresponding Author: Dr Corey S. Maas, The Maas Clinic, 2400 Clay Street, San Francisco, CA 94115, USA. E-mail: [email protected]

Revised July 25, 2020

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