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You could create Android and iPhone apps that contain this information. You could also advertise on there as well (although ads are annoying).
CenterWatch has a database:
From their site: Access the largest online database of industry-sponsored clinical trials actively seeking study volunteers.
A non-profit organization dedicated to engaging the public and patients as partners in the clinical research process: https://www.ciscrp.org/about-us/what-we-do/