Other Resources Join our CommunityWelcome to APDA - Greater St. Louis Chapter We have a number of other resources available. If you are interested in brain donation, please visit our Brain Donation page. To learn more about the current research being done in the field of Parkinson disease, visit our Research page. If you would like to join a class to work on and learn more about the impact of PD on the voice, visit our Voice & Singing page. To view more resources about Parkinson’s, visit our Helpful Links and Videos page.