1. The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China
2. Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai 200032, China
3. Department of Gastroenterology, 411 Hospital of PLA, Shanghai 200081, China
4. Department of Neurosurgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China