RT Journal Article SR Electronic T1 Obstetrical chart JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 298 OP 298 VO 20 IS 100 A1 J. N. Mein YR 1970 UL http://bjgp.org/content/20/100/298.2.abstract AB