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That study does indeed exist, and several outlets (1, 2, 3, 4) refer to it. It was conducted by Yoshihiko Koga, a japanese psychiatrist and professor at Kyorin University. It was originally cited, but not linked to, in the japanese website Excite.co.jp. I could not, however, find a link to the paper itself. The abovementioned outlets link to the supposed ...


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