Dr. YUE Jia-ning and Dr. LUO Zhe contributed equally to this article. Correspondence to: Dr. ZHU Du-ming, Department of Anesthesiology and Surgical Intensive Care Unit, Zhongshan Hospital, Fudan Universiy, Shanghai 200032, China (Tel: 86-21-64041990 ext. 2724. Email: zhu.duming@ zs-hospital.sh.cn); Dr. FU Wei-guo, Department of Vascular Surgery, Zhongshan Hospital, Fudan University, Shanghai 200032, China (Tel: 86-21-64041990 ext. 2904. Fax: 86-21-64038308. Email: fu.weiguo@zs-hospital.sh.cn)