包头地区918例儿童不同年龄阶段4种矿物质元素水平变化趋势及差异性比较

贺春蕾

Four mineral element level changes trend and comparison of difference in 918 cases of children of different ages in Baotou.

HE Chun-lei.

中国儿童保健杂志 . 2014, (2): 218 -221 .