RT Journal Article SR Electronic T1 Poor Posture and Low Back Pain JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 91 OP 97 VO 9 IS 2 A1 Zeiter, W. J. A1 Ward, G. J. YR 1942 UL http://www.ccjm.org/content/9/2/91.abstract AB