title: An association between cluster headache and herpes simplex.
mesh_terms: D000328:Adult; D003027:Cluster Headache / Q000209:etiology*; D006560:Herpes Labialis / Q000150:complications; D006561:Herpes Simplex / Q000150:complications*; D006801:Humans; D008297:Male; D014653:Vascular Headaches / Q000209:etiology*