RT Journal Article SR Electronic T1 II JF Journal of the College of General Practitioners and Research Newsletter JO J Coll Gen Pract Res Newsl FD British Journal of General Practice SP 47 OP 51 VO 1 IS 1 A1 Laidlaw, A. J. YR 1958 UL http://bjgp.org/content/1/1/47.abstract AB