Researchers at UNC in China studied more than 750 Chinese men women, aged between 40 59, in three rural villages in north south China.

• 北卡罗林娜大学在中国的研究者选取了750名以上的男性和女性居民，他们来自中国南部和北部的三个乡村地区，年龄在40到59岁之间。