RT Journal Article SR Electronic T1 Review: patients with acute low back pain and associated disability improve substantially within 1 month JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 27 OP 27 DO 10.1136/ebm.9.1.27 VO 9 IS 1 YR 2004 UL http://ebm.bmj.com/content/9/1/27.abstract AB