1. Department of Anaesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
2. Department of Family Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan
3. Department of Anaesthesiology, New Taipei Municipal TuCheng Hospital (Built and Operated by Chang Gung Medical Foundation), New Taipei City, Taiwan
4. Department of Anaesthesiology, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan
5. Department of Anaesthesiology, New Taipei Municipal TuCheng Hospital, No. 6, Sec. 2, Jincheng Rd., Tucheng Dist., New Taipei City, Taiwan