RT Journal Article SR Electronic T1 Buying and selling practices JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 573 OP 573 VO 36 IS 293 A1 T.R.G. Howard YR 1986 UL http://bjgp.org/content/36/293/573.1.abstract AB