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 ep75 OP ep75 DO 10.1136/adc.2004.050237corr1 VO 89 IS 3 YR 2004 UL http://ep.bmj.com/content/89/3/ep75.2.abstract AB