title: Comparing classical Horner's syndrome and the "partial syndrome" in cluster headache.
mesh_terms: D003027:Cluster Headache / Q000503:physiopathology*; D006732:Horner Syndrome / Q000503:physiopathology*; D006801:Humans; D013546:Sweating; D014653:Vascular Headaches / Q000503:physiopathology*