There is an article in WDDTY (May2015) about research carried out at the University of Kent. Lead researcher Prof Stephen Peckham said "The difference between the West Midlands, which fluoridates and Manchester, which doesn't was striking. There was nearly double the number of cases (of hypothyroidism) in the West Midlands. This is an interesting article and the ref is J.Epidemiol Community Health,2015;doi:10.1136/jech-2014-204971.
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