Dementia risk increases with latitude (less vitamin D) - Feb 2015

Sweden Dementia Twin Females

Geographical Variation in Dementia March 2015 - behind paywall
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United Kingdom - Dementia

ITVNews Jan 2013
Green = higher risk, not red!!
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United States - Parkinson's Disease

Nature 2013
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Europe - Parkinson's Disease

https://www.23andme.com/about/factoids/23andMe
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See also VitaminDWiki

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