1. Department of Anesthesiology, E-Da Hospital and I-Shou University, Kaohsiung, Taiwan
2. Division of Cardiovascular Surgery, Department of Surgery, E-Da Hospital and I-Shou University, Kaohsiung, Taiwan
3. Department of Anesthesiology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chia-Yi, Taiwan
4. Department of Critical Care Medicine, E-Da Hospital and I-Shou University, Kaohsiung, Taiwan.