| Abstract: | The relationship of causeresult between low selenium
(Se) and KashinBeck disease (KBD) was probed by the prospective study of epidemiological
method with regarding lowSe as an exposure factor in this paper. 597 healthy children lived in
KBD areas with low, middle and high prevalence were divided into the lowSe exposed group
and the nonlowSe exposed group according to their Se content in hair. The lowSe exposed
group was divided into three subgroups, such as Se content in hair110 ng/g, 110 ng/g
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