Ethics approval and consent to participate
The study protocol was reviewed and approved by the IRB of the University of Pennsylvania. There are reliance agreements with the University of Alabama at Birmingham and The Children’s Hospital of Philadelphia through the SMART IRB. The University of Edinburgh has approval through the Research Ethics Committee in the Department of Clinical and Health Psychology. Teens under 18 years of age provided assent; teens over 18 years of age provided informed consent. Parents consented for themselves and gave parental permission for teens under 18 years old.