RT Journal Article SR Electronic T1 EFFECTIVENESS AND EFFICIENCY IN HEALTH EDUCATION JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 440 OP 440 VO 29 IS 204 A1 D. J. Pereira Gray YR 1979 UL http://bjgp.org/content/29/204/440.3.abstract AB