RT Journal Article SR Electronic T1 Usual care in back pain trials JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 209 OP 210 DO 10.3399/bjgp09X419574 VO 59 IS 560 A1 Robert Froud A1 Martin Underwood YR 2009 UL http://bjgp.org/content/59/560/209.3.abstract AB