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 600 OP 601 DO 10.1136/adc.65.6.600 VO 65 IS 6 A1 K Asen YR 1990 UL http://adc.bmj.com/content/65/6/600.abstract AB