RT Journal Article SR Electronic T1 The diagnostic inaccuracy of the pain response in cervical discography JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 35 OP 39 VO 36 IS 1 A1 Klafta, Leonard A. A1 Collis, John S. YR 1969 UL http://www.ccjm.org/content/36/1/35.abstract AB