Written informed consent was obtained from parents and
written and verbal assent were obtained from all participants
prior to study participation. The study was approved
by each hospital’s Institutional Review Board. Measures in
this study were administered as part of a comprehensive
baseline assessment for the treatment study. A research
assistant mailed pain diaries with instructions to the participants
prior to the assessment, and participants brought
the completed diaries to the study visit. During the assessment,
parents and children completed self-report questionnaires
separately and a trained psychologist or psychology
fellow conducted a standardized psychiatric interview.
Upon completion, participants were given a gift coupon
in appreciation for their time and effort.