Feldman, Steven R, George Han, Valerie Callender, Leon Kircik, Linda Stein Gold, Neal Bhatia, Stephen K Tyring, and Joshua Zeichner. 2022. “Benefit of Topical Combination Therapy for Acne Treatment: Analysis of Effect Size Using Number Needed to Treat”. SKIN The Journal of Cutaneous Medicine 6 (6):s86. https://doi.org/10.25251/skin.6.supp.86.