1. School of Nursing, Xi'an Medical University Xi'an Shaanxi 710021 China
2. Nephrotic Hemodialysis Center, Shanxi Provincial People Hospital Xi'an Shaanxi 710068 China
3. Hemodialysis Center, Department of Nephrology and Endocrinology The Second Affiliated Hospital of Xi'an Medical University Xi'an Shaanxi 710038 China