RT Journal Article SR Electronic T1 New Zealand College JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 265 OP 265 VO 22 IS 117 A1 C. L. E. L. Shepherd YR 1972 UL http://bjgp.org/content/22/117/265.1.abstract AB