1. Department of Anesthesiology; Taipei Veterans General Hospital; Taipei Taiwan
2. Department of Nursing; National Yang-Ming University; Taipei Taiwan
3. Institute of Public Health; National Yang-Ming University; Taipei Taiwan
4. National Health Insurance Administration; Taipei Taiwan
5. Institute of Hospital and Health Care Administration; National Yang-Ming University; Taipei Taiwan
6. Institute of Clinical and Community Health Nursing; National Yang-Ming University; Taipei Taiwan