PR, Burch, and Rowell NR. “Lupus Erythematosus. Analysis of the Sex- and Age-Distributions of the Discoid and Systemic Forms of the Disease in Different Countries”. Acta Dermato-Venereologica, vol. 50, no. 4, Nov. 2019, pp. 293-01, doi:10.2340/0001555550293301.