Harvima, R., Viinamäki, H., Harvima, I., Naukkarinen, A., Savolainen, L., Aalto, M., & Horsmanheimo, M. (1996). Association of psychic stress with clinical severity and symptoms of psoriatic patients. Acta Dermato-Venereologica, 76(6), 467–471. https://doi.org/10.2340/0001555576467471