I don't have any studies to link but at some point I read up on this and reached the same conclusion. The "discoverer" wrote a popular book about it that appare

I don't have any studies to link but at some point I read up on this and reached the same conclusion. The "discoverer" wrote a popular book about it that apparently caught the public imagination, but IIRC it was based on a small handful of cases, and if you try to find stats the number of people involved doesn't seem to differ much from what you'd expect for tourists having miscellaneous sorts of nervous episodes (or whatever the term would be).