RT Journal Article SR Electronic T1 Vitamin D supplementation for women before and during pregnancy: an update of the guidelines, evidence, and role of GPs and practice nurses JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 423 OP 424 DO 10.3399/bjgp17X692489 VO 67 IS 662 A1 Catherine Hynes A1 Amrita Jesurasa A1 Patricia Evans A1 Caroline Mitchell YR 2017 UL http://bjgp.org/content/67/662/423.abstract AB