RT Journal Article SR Electronic T1 Epistle 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 41 OP 41 DO 10.1136/adc.2011.214155 VO 96 IS 2 A1 Ian Wacogne YR 2011 UL http://ep.bmj.com/content/96/2/41.abstract AB