The cyclic relationship of natural illumination to cluster period frequency.
California Medical Clinic for Headache, Encino 91436.
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D003027:Cluster Headache / Q000503:physiopathology*; D006801:Humans; D008027:Light; D008297:Male; D012189:Retrospective Studies; D012621:Seasons; D014653:Vascular Headaches / Q000503:physiopathology*