RT Journal Article SR Electronic T1 Vitamin D in pregnancy: an old problem still to be solved? JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 740 OP 741 DO 10.1136/adc.2007.120774 VO 92 IS 9 A1 A F Williams YR 2007 UL http://adc.bmj.com/content/92/9/740.abstract AB