1. Department of Neurological Surgery, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangwon-do, Korea.
2. Department of Radiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangwon-do, Korea.
3. Department of Anesthesiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangwon-do, Korea.
4. Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangwon-do, Korea.