“Efficacy of red-light photodynamic therapy with 10% ALA gel in relation to the epidermal extent of atypical keratinocytes in actinic keratosis - Retrospective exploratory analysis of three pivotal phase III trials”, J of Skin, vol. 6, no. 6, p. s93, Nov. 2022, doi: 10.25251/skin.6.supp.93.