Comparison of 15% 5-aminolevulinic acid and 10% 5-aminolevulinic acid photodynamic therapy for the treatment of acne vulgaris: a split-face randomized pilot study - Brzezińska, Natalia; Bulińska, Barbara; Zawadzka, Natalia; Roter, Gustaw; Szczerkowska-Dobosz, Aneta (Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii, 2024)