Approval for the study was obtained from the hospital ethics committees. To identify potential subjects, a leaflet containing details of the study and a demographic sheet have been mailed to all parents of childhood cancer survivors in the Sunshine Group and Children's Cancer Foundation. If children and their parents are interested in the research, they can return the demographic sheet by using the enclosed return-envelop to convey their willingness to participate in the study. A briefing session will then be conducted in the out-patient clinic to those eligible children and parents. Written consent has been obtained from the parents after they were told the purposes of the study, although they were of course given the option of allowing or refusing the involvement of their child. The children has also been invited to put their names on a special children's assent form and told that their participation is voluntary.