RT Journal Article SR Electronic T1 Clinical trials in general practice JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 267 OP 268 VO 32 IS 238 A1 V. W. M. Drury YR 1982 UL http://bjgp.org/content/32/238/267.abstract AB