RT Journal Article SR Electronic T1 “Mechanical Backache”—the Most Common Type of Low Back Pain JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 113 OP 117 VO 15 IS 3 A1 Phalen, George S. YR 1948 UL http://www.ccjm.org/content/15/3/113.abstract AB