1. Department of Anesthesiology, Phramongkutklao Hospital and Phramongkutklao College of Medicine , Bangkok, 10400, Thailand
2. Department of Anaesthesiology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University , Bangkok, 10400, Thailand
3. Northwestern University Feinberg School of Medicine Departments of Anesthesiology, Neurology, Physical Medicine & Rehabilitation, Psychiatry and Neurosurgery, , Chicago, IL 60611, United States
4. Johns Hopkins School of Medicine Departments of Anesthesiology, Neurology, Physical Medicine & Rehabilitation and Psychiatry and Behavioral Sciences, , Baltimore, MD, United States
5. Walter Reed National Military Medical Center Departments of Physical Medicine & Rehabilitation and Anesthesiology, , Uniformed Services University of the Health Sciences, Bethesda, MD 20889, United States