RT Journal Article SR Electronic T1 Retraction notice 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 F252 OP F252 DO 10.1136/archdischild-2012-303508ret VO 99 IS 3 YR 2014 UL http://fn.bmj.com/content/99/3/F252.1.abstract AB