RT Journal Article SR Electronic T1 Alford's theoretical work JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 651 OP 651 DO 10.3399/bjgp08X342156 VO 58 IS 554 A1 Mark Freeman YR 2008 UL http://bjgp.org/content/58/554/651.2.abstract AB