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• Fredriksson T, Pettersson U. Severe psoriasis—oral therapy with a new retinoid. Dermatologica. 1978;157(4):238-244. doi:10.1159/000250839

• Feldman SR, Krueger GG. Psoriasis assessment tools in clinical trials. Ann Rheum Dis. 2005;64(Suppl 2):ii65–ii73. doi:10.1136/ard.2004.031237

3 The RS Domain Model

3.1 Assumptions for the RS Domain Model

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