 - Exclusion related to prior drug treatments: Use of Zaditen Ketotifen within 14 days prior to first SCR visit; Use of Doxepin AZU and other tricyclic antidepressants with antihistaminergic properties within 14 days prior to first SCR visit; Use of H2 antihistamines within 7 days prior to first SCR visit; Use of H1 antihistamines within 7 days prior to first SCR visit; Use of monteleukast or any other leukotriene antagonist within 7 days prior to first SCR visit; Use of biologicals including omalizumab within 5 months prior to first SCR visit. 