TY - JOUR T1 - OBSTETRICS, CONTRACEPTION AND GYNAECOLOGY JF - The Journal of the Royal College of General Practitioners JO - J R Coll Gen Pract SP - 60 LP - 60 VL - 27 IS - 174 AU - M. I. Cookson Y1 - 1977/01/01 UR - http://bjgp.org/content/27/174/60.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -