title: Role of genetic and environmental factors in the clinical picture and course of psoriasis--a study on twins.
mesh_terms: D000293:Adolescent; D000328:Adult; D001722:Birth Order; D004200:Diseases in Twins; D004777:Environment; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D011565:Psoriasis / Q000175:diagnosis / Q000235:genetics*; D012737:Sex Factors