1. Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University Health Science Center, Xi'an, China.
2. Department of Nephrology and Endocrinology, Weinan Central Hospital, Weinan, China.
3. Department of Epidemiology and Biostatistics, School of Public Heath, Xi'an Jiaotong University Health Science Center, Xi'an, China.