Berman, Brian, Neal Bhatia, Daniel Piacquadio, Anna Houlihan, and Daniel Siegel. 2020. “Efficacy of ALA–PDT in the Treatment of Actinic Keratoses on the Upper Extremities: A Post Hoc Analysis of a Phase 3, Randomized, Vehicle-Controlled Trial”. SKIN The Journal of Cutaneous Medicine 4 (5):s66. https://doi.org/10.25251/skin.4.supp.65.