RT Journal Article SR Electronic T1 BUTTERWORTH GOLD MEDAL ESSAY JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 571 OP 571 VO 28 IS 194 A1 F. J. Darby YR 1978 UL http://bjgp.org/content/28/194/571.2.abstract AB