1. Department of Neurology, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
2. Department of Neurology; Metro hospital; Anyang South Korea
3. Department of Gastroenterology, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
4. Health Screening and Promotion Center, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
5. Department of Neurology; Bobath Memorial Hospital; Seongnam Republic of Korea
6. Division of Biostatistics, Center for Medical Research and Information, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
7. Asan Institute for Life Sciences, Asan Medical Center; Seoul South Korea
8. Department of Pathology, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea