1. Department of Nephrology Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China
2. Department of Postgraduate Student Xi'an Medical University Xi'an Shaanxi 710021 China
3. Department of Nephrology 980th Hospital of PLA Joint Logistical Support Force (Bethune International Peace Hospital) Shijiazhuang Hebei 050082 China
4. School of Clinical Medicine Health Science Center Xi'an Jiaotong University Xi'an Shaanxi 710049 China
5. Department of Geriatric Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China