Feldman, S., G. Han, V. Callender, L. Kircik, L. Stein Gold, N. Bhatia, S. Tyring, and J. Zeichner. “Benefit of Topical Combination Therapy for Acne Treatment: Analysis of Effect Size Using Number Needed to Treat”. SKIN The Journal of Cutaneous Medicine, vol. 7, no. 3, May 2023, p. s211, doi:10.25251/skin.7.supp.211.