1. Department of Anesthesiology and Pain Medicine, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, People's Republic of China
2. Department of Hepatobiliary Surgery, The Second Hospital, Hebei Medical University, Shijiazhuang, People's Republic of China
3. School of Human and Social Sciences, University of West London, London, UK
4. Intensive Care Unit, Wuhan Medical Treatment Center, Wuhan, P. R. China