Latest figures show that in 1990, 3.68 million people had dementia in China and by 2010 this number had risen to 9.2 million

The international study, led by the University of Edinburgh and published in The Lancet, reviewed almost 90 public health studies that included the health information of almost 350,000 people in China. 

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http://www.medicalnewstoday.com/releases/261645.php