My thanks go to Debi Brooks for highlighting the importance of the Parkinson's Progression Markers Initiative (PPMI) database, sponsored by MJFox.
If you are interested in DOING research, I encourage you to apply for data access:
http://www.ppmi-info.org/access-data...download-data/
Once registered you can download the data in comma separated values files. These can, for instance, be imported to Excel. From there it's down to your
creativity in asking the right questions.
Happy data mining.
John