title: Immunological phenomena in cluster headache: a controversy.
mesh_terms: D000936:Antigen-Antibody Complex / Q000032:analysis*; D003027:Cluster Headache / Q000276:immunology*; D006801:Humans; D014653:Vascular Headaches / Q000276:immunology*
chemical_list: D000936:Antigen-Antibody Complex