Todberg, T., L. Skov, S. Simonsen, K. Kainu, and C. Zachariae. “Efficacy of Apremilast in Patients With Prurigo Nodularis: A Proof-of-Concept Study”. Acta Dermato-Venereologica, vol. 100, no. 8, Apr. 2020, pp. 1-2, doi:10.2340/00015555-3461.