RT Journal Article SR Electronic T1 Commentary JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 309 OP 309 DO 10.1136/adc.63.3.309 VO 63 IS 3 A1 N Rutter YR 1988 UL http://adc.bmj.com/content/63/3/309.2.abstract AB