RT Journal Article SR Electronic T1 The study and evaluation of general practice. Hypotheses concerning evaluation. JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 887 OP 894 VO 23 IS 137 A1 P. Mansfield YR 1973 UL http://bjgp.org/content/23/137/887.abstract AB