Lindberg, Ingrid, Mathias Lilja, Kirk Geale, Haijun Tian, Craig Richardson, Amie Scott, and Amra Osmancevic. 2020. “Incidence of Psoriatic Arthritis in Patients With Skin Psoriasis and Associated Risk Factors: A Retrospective Population-Based Cohort Study in Swedish Routine Clinical Care”. Acta Dermato-Venereologica 100 (18):1-6. https://doi.org/10.2340/00015555-3682.