Affiliation: | 1. Chulalongkorn Center of Excellence on Parkinson's Disease and Related Disorders, Chulalongkorn University and King Chulalongkorn Memorial Hospital, , Bangkok, Thailand;2. Department of Pathology, Chulalongkorn University and King Chulalongkorn Memorial Hospital, , Bangkok, Thailand;3. Division of Gastroenterology, Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, , Bangkok, Thailand;4. Department of Neurology, Geffen School of Medicine at UCLA, , Los Angeles, California, USA |