Intervention Compliance Monitoring
During semesters, children in the intervention group completed treatment at school. During summer and winter vacations, guardians were trained by teachers to supervise the intervention at home. The device was linked to the internet with an automated diary function to record the treatment history. In addition, 2 investigators (X.H. and J.W.) were responsible for the intervention compliance management. School teachers or parents or legal guardians were reminded about the intervention to improve treatment compliance every week.