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Thank you, Norman. That was an extremely interesting article.
There may not be a single database with absolutely everything, but there are many that can be very useful. I’ve looked at several, depending on what I’m interested in locating. For example, the U.S. National Library of Medicine has https://clinicaltrials.gov where you can search by topic or medical condition, along with options like location and many other criteria (recruiting, completed, etc.).
Other resources include PubMed Central, NIH and many, many more. If you search online for database medical studies or trials, you’ll see lots of option that are either open for use to all or requires a free registration.
Good hunting!