1. Department of Environmental Medicine, School of Medicine, Chosun University, Gwangju, Korea.
2. Department of Rehabilitation Medicine, Wonju Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
3. Department of Internal Medicine, School of Medicine, Chosun University, Gwangju, Korea.
4. Department of Neurosurgery, School of Medicine, Chosun University, Gwangju, Korea.