Intervention: Parents/caregivers and occupational therapists were responsible for the hospital-based rehabilitation service. For the hospital-based program, the research team discussed with the clinical therapists who provided training program in a hospital for 120 minutes/per session, 2 sessions/per week for a total of 9-week intervention. In addition, the research team videotaped the child's natural play and driving performance at the hospital for 20 minutes/per session, 1 session/per week during the 9-week intervention phase. The treatment program of the two sessions was pre-planned and adjusted by the occupational therapist through clinical observation of participant's performance in the previous session. Training concentrated on building the concept of casual-effect on the switch and car motion, goal-oriented driving (e.g., driving 200 meters and reach for a toy or contact with a person), and upper limb use in functional tasks with driving in a hospital,discussed by the family, the treating therapist and the research team.