1. Department of Geriatrics, Xining No.1 People’s Hospital, Xining, Qinghai, China (mainland)
2. Department of Neurology, Qinghai Provincial People’s Hospital, Xining, Qinghai, China (mainland)
3. Department of Orthopedics, Xining No. 1 People’s Hospital, Xining, Qinghai, China (mainland)
4. Department of Neurosurgery, Xining No. 1 People’s Hospital, Xining, Qinghai, China (mainland)
5. Department of Geriatrics, Xining No. 1 People’s Hospital, Xining, Qinghai, China (mainland)