Hello @jameswright and welcome to Connect. If you are interested in learning more about clinical trials at Mayo Clinic, here is the website where you can find more information, https://www.mayo.edu/research/clinical-trials/about-clinical-studies. As you can see, there is a phone number where you can call.

Also, here is a link to the National Library of Medicine, where you can search for clinical trials worldwide.
https://www.clinicaltrials.gov/
As this is your first post, and as you are comfortable doing so, please share a bit more about your wife's journey with Parkinson's. Is Parkinson's a new diagnosis for your wife? What symptoms are the most difficult for her right now?