RT Journal Article SR Electronic T1 NUMBER 15 PRINCES GATE JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 442 OP 442 VO 28 IS 192 A1 M. G. Sheldon YR 1978 UL http://bjgp.org/content/28/192/442.1.abstract AB