RT Journal Article SR Electronic T1 Dietary supplements in pregnancy. JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 707 OP 711 VO 31 IS 233 A1 Smail, S. A. YR 1981 UL http://bjgp.org/content/31/233/707.abstract AB