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Cho SJ, Kim BK, Kim BS, Kim JM, Kim SK, Moon HS, Cha MJ, Park KY, Sohn JH, Chu MK, Song TJ.  Associations of Elderly Onset Headache With Occurrence of Poor Functional Outcome, Cardiovascular Disease, and Cognitive Dysfunction During Long-term Follow-up.  Annals of Geriatric Medicine and Research 1999;0:-.  https://doi.org/10.4235/agmr.18.0032