Objective To analyse the result of exterior quality control about 30 counties iodize salt labs.

目的对200130个实验室外质控结果进行分。

One of the attractions is that a campaign to iodize salt costs only 2 cents to 3 cents per person reached per year.

吸引人的一个原因是人只要花费2到3分钱就可以食用。