RT Journal Article SR Electronic T1 Antenatal ultrasound in 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 275 OP 275 VO 38 IS 311 A1 C.B. Everett YR 1988 UL http://bjgp.org/content/38/311/275.2.abstract AB