title: The time relationships of migraine and cluster headache when occurring in the same patient.
mesh_terms: D000368:Aged; D003027:Cluster Headache / Q000209:etiology*; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000150:complications*; D013997:Time Factors; D014653:Vascular Headaches / Q000209:etiology*