RT Journal Article SR Electronic T1 Withdrawn by author JF Archives of Disease in Childhood - Fetal and Neonatal Edition JO Arch Dis Child Fetal Neonatal Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP A51 OP A51 DO 10.1136/fetalneonatal-2012-301809.162a VO 97 IS Suppl 1 YR 2012 UL http://fn.bmj.com/content/97/Suppl_1/A51.2.abstract AB