Berman, B., Bhatia, N., Piacquadio, D., Houlihan, A. and Siegel, D. (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), p. s66. doi: 10.25251/skin.4.supp.65.