Karoglan, A. et al. 2019. Safety and Efficacy of Topically Applied Selected Cutibacterium acnes Strains over Five Weeks in Patients with Acne Vulgaris: An Open-label, Pilot Study. Acta Dermato-Venereologica. 99, 13 (Oct. 2019), 1253–1257. DOI:https://doi.org/10.2340/00015555-3323.