1. Department of General Medicine, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
2. Department of Nephrology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
3. Department of Geriatrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China