TY - JOUR T1 - Dennis Vernon Duckworth, MB, BS, FRCGP JF - The Journal of the Royal College of General Practitioners JO - J R Coll Gen Pract SP - 511 LP - 511 VL - 30 IS - 217 AU - David H. S. Cannon Y1 - 1980/08/01 UR - http://bjgp.org/content/30/217/511.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -