1. Department of Neurology, the Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
2. Institute of Medical Sciences, the Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, China
3. Department of Geriatrics, South Branch of the Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250000, China
4. School of Nursing and Rehabilitation, Cheeloo College of Medicine, Shandong University, Jinan 250012, China