RT Journal Article SR Electronic T1 Difficulties encountered in classifying illness 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 474 OP 479 VO 23 IS 132 A1 D. J. Bain A1 W. J. Bassett A1 A. J. Haines YR 1973 UL http://bjgp.org/content/23/132/474.abstract AB