RT Journal Article SR Electronic T1 What does this study test, and why? JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 905 OP 905 VO 93 IS 10 A1 J Stone YR 2008 UL http://adc.bmj.com/content/93/10/905.2.abstract AB