寿县是安徽省北部的一座古老的小县城，这里的人们对豆腐的情感非同一般。
Shouxian County is an old little town in the north Anhui province, people there has a special attachment to tofu.
方法采用整群抽样方法，在安徽省北部地区既往卖血人员比较集中的村，对25~55岁的村民进行调查，包括问卷调查和艾滋病病毒抗体实验室检测。
Methods A cross-sectional survey was conducted among 25~55 years old rural residents in villages with former blood donors in north of Anhui of in China.
阜阳位于安徽省西北部，位于华北平原南端、淮北平原的西部是淮海经济区的重要组成部分。
Fuyang, Anhui Province, located in the north west, is located in the southern tip of the north China Plain, the western Huaibei Plain is an important part of the Huaihai economic zone.
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