1. Department of Cardiovascular Surgery, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261000, P.R. China
2. School of Anesthesiology, Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Weifang Medical University, Weifang, Shandong 261000, P.R. China
3. Department of Endocrinology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261000, P.R. China