1. Department of Neurosurgery, Anam Hospital, Korea University College of Medicine, Seoul, Korea.
2. CHA Biomedical Center, CHA University, Seoul, Korea.
3. Department of Statistics, Chonnam National University Medical School, Gwangju, Korea.
4. Institute of Environmental and Occupational Medicine, Department of Occupational and Environmental Medicine, Pusan Paik Hospital, Inje University College of Medicine, Busan, Korea.
5. Integrative Medicine Research Center, Anam Hospital, Korea University College of Medicine, Seoul, Korea.