1. Department of Neurology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China
2. Department of Neurology, Shaanxi Provincial People’s Hospital, Xi’an, China
3. Department of Gerontology, Shaanxi Provincial Corps Hospital, Chinese People’s Armed Police Forces, Xi’an, China
4. Department of Neurology, XiDian Group Hospital, Xi’an, China
5. Department of Gerontology, The Ninth Hospital of Xi’an, Xi’an, China
6. Clinical Research Central, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China