Differences in Study Population (IMAGE) IOS Press Caption Differences in study population, Parkinson's disease characteristics and methodology make it difficult to compare gut microbiome studies in Parkinson's disease. Credit Academy of Finland Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.