Study of Gastrointestinal Dysfunction and Enteric Neural Pathology in Patients With Parkinson's Disease

Inclusion Criteria: * Idiopathic Parkinson's disease as defined by the United Kingdom PD Society Brain Bank Criteria * Parkinson Disease Hoehn and Yahr stage 2-4 * Participants on stable dose of Parkinson Disease medications for at least 4 weeks prior to the study screening * Participants between 40 and 85 years old * Participants who are capable of giving informed consent Exclusion Criteria: * Atypical or secondary Parkinson Disease * Esophageal fistula and/or esophageal strictures with a luminal stricture diameter that is smaller than the diameter of the capsule * Recent intestinal resection (within the last six months) * Prior gastric, esophageal or oropharyngeal surgery * Inability to swallow capsules * Pregnancy, according to participant information