A randomized split-scalp study comparing calcipotriol-assisted methyl aminolaevulinate photodynamic therapy (MAL-PDT) with conventional MAL-PDT for the treatment of actinic keratosis - Torezan, L; Festa Neto, Cyro; Grinblat, B; Haedersdal, M; Valente, N; Szeimies, R. M (British journal of dermatology, 2018)