1. Department of Anesthesiology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
2. Department of Critical Care Medicine, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan Province, China.
3. Department of Hospice and Palliative Care, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan Province, China.
4. Department of Anesthesiology, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan Province, China.
5. Department of Pathology, Qinghai People's Hospital, Xining, Qinghai Province, China.