Berman, B.; Bhatia, N.; Piacquadio, D.; Houlihan, A.; Siegel, D. 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. J of Skin 2020, 4, s66.