2017. Design and rational of the OPTIMA Study: Retreatment or Step-Up Therapy with Omalizumab in Patients with Chronic Idiopathic/Spontaneous Urticaria (CIU/CSU). SKIN The Journal of Cutaneous Medicine. 1, 3.1 (Oct. 2017), s125. DOI:https://doi.org/10.25251/skin.1.supp.124.