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 ep104 OP ep104 DO 10.1136/adc.2004.069203corr VO 90 IS 4 YR 2005 UL http://ep.bmj.com/content/90/4/ep104.abstract AB