RT Journal Article SR Electronic T1 Robert Smith Gibson, MB, CH.B, DPH JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 252 OP 253 VO 28 IS 189 A1 W. Fraser Ross YR 1978 UL http://bjgp.org/content/28/189/252.abstract AB