RT Journal Article SR Electronic T1 Children of the 90s: ethical guidance for a longitudinal study JF Archives of Disease in Childhood - Fetal and Neonatal Edition JO Arch Dis Child Fetal Neonatal Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP F146 OP F151 DO 10.1136/fn.81.2.F146 VO 81 IS 2 A1 Mumford, S E YR 1999 UL http://fn.bmj.com/content/81/2/F146.abstract AB