1 Department of Metabolism and Endocrinology, The Second Affiliated Hospital of the University of South China, Hengyang, 421001, China.
2 Department of Metabolism and Endocrinology, The First Affiliated Hospital of the University of South China, Hengyang, 421001, China.
3 Department of Metabolism and Endocrinology, The First Affiliated Hospital of the University of South China, Hengyang, 421001, China. yangjing9803@hotmail.com.