Marte Ljosaa, Tone, Audun Stubhaug, Cato Mork, Torbjorn Moum, and Astrid k. Wahl. 2012. “Improvement in Psoriasis Area and Severity Index Score Predicts Improvement in Skin Pain Over Time in Patients With Psoriasis”. Acta Dermato-Venereologica 93 (3):330-34. https://doi.org/10.2340/00015555-1456.