RT Journal Article SR Electronic T1 The end of practice-based research? JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 52 OP 52 DO 10.3399/bjgp09X394897 VO 59 IS 558 A1 John Campbell Murdoch YR 2009 UL http://bjgp.org/content/59/558/52.abstract AB