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It's a mix of two actually,
it was during an oral hygiene camp in 2016 I guess, more than 50 pairs of twins showed up. Doctors were surprised and later found out, more than 350 pairs of twins were living there in the population of just 2000.
Sadly, i couldn't find a single research paper on this topic.

 4 years ago (edited) 

Too bad no one undertook any research on that... But well... it is what it is. Thanks for the specifications.