1. Department of Diabetes Complications and Metabolism, Beckman Research Institute of City of Hope, Duarte, California.
2. Department of Nephrology, First Hospital of Jilin University, Changchun, China.
3. Department of Nephrology, Second Hospital of Jilin University, Changchun, China.
4. Department of Internal Medicine, College of Medicine, Yonsei University, Seoul, Republic of Korea.