RT Journal Article SR Electronic T1 Letters JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 79 OP 79 VO 38 IS 307 A1 Surinder Singh A1 Simon Mansfield YR 1988 UL http://bjgp.org/content/38/307/79.1.abstract AB