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萧山市地处浙江省北部，钱塘江南岸，除市域西南部山地丘陵区属轻度碘缺乏病区外，中部水网平原区及东北部沙地平原区曾被视为非病区（以下简称非病区）。全市人口达１１２万，其中碘缺乏病区人口占全市总人口的１／４。１９８７年开始在病区采取食用碘盐补碘，１９９５年９月
Xiaoshan City is located in the northern part of Zhejiang Province and the south bank of Qiantang River. In addition to mild iodine deficiency disease in the hilly area in the southwest of the city, the central plain of water network and the plain in the northeast have been considered as non-ward (hereinafter referred to as Non-ward). The city’s population of 1.12 million, of which the population of iodine deficiency ward accounted for the city’s total population of 1 / 4. In 1987 began to eat iodized salt in the ward iodine, September 1995