1. Department of Endocrinology, The Second Hospital of Tianjin Medical University, Tianjin, 300211, P. R. China
2. Department of Nephrology, The Second Hospital of Tianjin Medical University, Tianjin, 300211, P. R. China
3. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, P. R. China