Danielsen, K. (2018) “Prevalence of Psoriasis and Psoriatic Arthritis and Patient Perceptions of Severity in Sweden, Norway and Denmark: Results from the Nordic Patient Survey of Psoriasis and Psoriatic Arthritis”, Acta Dermato-Venereologica, 99(1), pp. 18–25. doi: 10.2340/00015555-3017.