RT Journal Article SR Electronic T1 OBSTETRICS AND GYNAECOLOGY FOR 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 121 OP 121 VO 31 IS 223 A1 John Hasler YR 1981 UL http://bjgp.org/content/31/223/121.1.abstract AB