RT Journal Article SR Electronic T1 Headache Caused by Arthritis of the Cervical Spine JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 261 OP 264 VO 6 IS 4 A1 Hartsock, C. L. YR 1939 UL http://www.ccjm.org/content/6/4/261.abstract AB