1. Department of Cardiology, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
2. Department of Anesthesiology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
3. Cardio‑Cerebrovascular Control and Research Center, Basic Medical College, Shandong First Medical University, Jinan, Shandong 250062, P.R. China