1. Second Department of Respiratory and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
2. Department of Respiratory and Critical Care Medicine, Harrison International Peace Hospital Affiliated to Hebei Medical University, Hengshui, China
3. Department of Neurosurgery, Harrison International Peace Hospital Affiliated to Hebei Medical University, Hengshui, China
4. Department of Gerontology, Harrison International Peace Hospital Affiliated to Hebei Medical University, Hengshui, China