OUTLINE: This is a randomized, multicenter study. Patients are stratified according to age (8-12 vs 13-20) and treatment (current vs previous). Patients are randomized to one of two arms of the study. Arm I (Reliability): Patients will complete the same questionnaire two weeks apart. (age 13-20 stratum closed as of 7/14/00) Arm II (Validity): Patients will complete a study questionnaire plus a Child Health Questionnaire. Patients between ages 8-12 are interviewed and patients between ages 13-20 complete a written questionnaire.