RT Journal Article SR Electronic T1 Correction JF Archives of disease in childhood - Education & practice edition JO Arch Dis Child Educ Pract Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 39 OP 39 DO 10.1136/edpract-2012-302003 VO 98 IS 1 YR 2013 UL http://ep.bmj.com/content/98/1/39.3.abstract AB