1. Department of Nephrology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
2. Department of Computer Science, National University of Singapore, Singapore
3. School of Medicine, Royal College of Surgeons in Ireland, Dublin, Ireland
4. People's hospital of Tongchuan, Tongchuan, Shaanxi Province, China
5. Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA