RT Journal Article SR Electronic T1 Low-back pain JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 325 OP 325 DO 10.1503/cmaj.113-2105 VO 185 IS 4 A1 Rachelle Buchbinder A1 Martin Underwood YR 2013 UL http://www.cmaj.ca/content/185/4/325.2.abstract