title: The Psoriasis Area and Severity Index and alternative approaches for the assessment of severity: persisting areas of confusion.
authors.forename: P C
authors.initials: PC
authors.lastname: van de Kerkhof
mesh_terms: D006801:Humans; D011565:Psoriasis / Q000188:drug therapy* / Q000473:pathology; D012720:Severity of Illness Index; D016896:Treatment Outcome