1. Dialysis Department of Nephrology Hospital, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, China
2. Department of Nephrology, the First Affiliated Hospital of Xi'an Medical University, Xi'an 710077, China
3. Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Basic Medical Sciences, Xi'an 710061, China
4. Department of Anesthesiology, Center for Brian Science, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
5. Gansu Provincial Maternity and Child-care Hospital, Lanzhou 730050, China