“Efficacy and Safety of Apremilast in Patients With Moderate to Severe Plaque Psoriasis of the Scalp: Results of a Phase 3, Multicenter, Randomized, Placebo-Controlled, Double-Blind Study”, J of Skin, vol. 3, no. 2, p. 170, Mar. 2019, doi: 10.25251/skin.3.2.10.