1. Department of Respiratory and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China.
2. Department of Respiratory and Critical Care Medicine, Affiliated Xing Tai People Hospital of Hebei Medical University, Xingtai, China.
3. Department of Anesthesiology, and Affiliated Xing Tai People Hospital of Hebei Medical University, Xingtai, China.
4. Department of Pathology, Affiliated Xing Tai People Hospital of Hebei Medical University, Xingtai, China.
5. Department of Neurosurgery, Handan First Hospital, Handan, China.