RT Journal Article SR Electronic T1 BRITISH BIRTHS 1970 VOL. 2: OBSTETRIC CARE JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 438 OP 439 VO 29 IS 204 A1 M. I. Cookson YR 1979 UL http://bjgp.org/content/29/204/438.2.abstract AB