I have spent the last couple hours researching this; it seems like everyone out there is quoting this line that stress is the health epidemic of the 21st century however it's nowhere to be found in any major databases, the WHO site, etc.
I think this is a great example of Viral plagiarism - the mass replication and dissemination of a piece of info someone Else wrote, repeated over and over... in-text citation is only valid if it's accurate, and yet everyone keeps repeating the same 'fake news'... repeating false information doesn't make it true, it simply means the repeater didn't do their due diligence.
