RT Journal Article SR Electronic T1 To be taken as directed. JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 39 OP 44 VO 16 IS 1 A1 Gatley, M. S. YR 1968 UL http://bjgp.org/content/16/1/39.abstract AB