Comment: The comparison groups were also from rural China and Iran.

(See in situ)

In reply to comment: PRNewswire is not news. (see in situ)

The comparison groups were also from rural China and Iran.

It's not like they were comparing rural Asian kids to suburban American kids.

From the conclusion of the cited article:
"The results support the possibility of an adverse effect of high fluoride exposure on children's neurodevelopment."

The people who forwarded these results to Reuters have an agenda. So what? That doesn't disqualify all of their sources.