Ekelund, M.; Mallbris, L.; Qvitzau, S.; Stenberg, B. A Higher Score on the Dermatology Life Quality Index, Being on Systemic Treatment and Having a Diagnosis of Psoriatic Arthritis Is Associated With Increased Costs in Patients With Plaque Psoriasis. Acta Derm Venereol 2013, 93, 684-688.