Qiang Lu1, Chunming Ma1, Fuzai Yin2. 1. Department of Endocrinology, the First Hospital of Qinhuangdao, Qinhuangdao, Hebei Province, China. 2. Department of Endocrinology, the First Hospital of Qinhuangdao, Qinhuangdao, Hebei Province, China. yinfuzai62@163.com.