1. Department of Neurology, Seoul Metropolitan Government‐Seoul National University Boramae Medical Center Seoul National University College of Medicine Seoul South Korea
2. Department of Neurology, Samsung Medical Center Sungkyunkwan University School of Medicine Seoul South Korea
3. Department of Neurology Korea University Guro Hospital Seoul South Korea
4. Department of Neurology National Neuroscience Institute Singapore Singapore
5. Department of Neurology Kyung Hee University Hospital Seoul South Korea
6. Division of Gastroenterology, Department of Internal Medicine Seoul National University Bundang Hospital Seongnam South Korea
7. Department of Neurology Hanyang University Medical Center Seoul South Korea