1. Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul, Korea.
2. National Traffic Injury Rehabilitation Research Institute, National Traffic Injury Rehabilitation Hospital, Yangpyeong, Korea.
3. Department of Rehabilitation Medicine, National Traffic Injury Rehabilitation Hospital, Yangpyeong, Korea.
4. Institute of Health Policy and Management, Medical Research Center, Seoul National University, Seoul, Korea.
5. Department of Public Health, Graduate School, Yonsei University, Seoul, Korea.
6. Department of Epidemiology and Health Promotion, Institute for Health Promotion, Graduate School of Public Health, Yonsei University, Seoul, Korea.