1. Department of Vascular Surgery, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
2. Department of Anesthesiology, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
3. Department of Pain Management, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China
4. Department of Pathology, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China