国家自然科学基金81060226;爱德基金会甘肃省碘缺乏病防治项目41010406;甘肃省卫生行业科研计划项目GWGL-2010-35;grants from the National Natural Science Foundation of China81060226;IDD Project of the Amity Foundation41010406;Management Project of Gansu Provincial Health Scientific Research PlanGWGL-2010-35