1. Department of Anesthesiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
2. Department of Anesthesiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
3. Department of Anesthesiology, King Chulalongkorn Memorial Hospital, Bangkok, Thailand
4. Chakri Naruebodindra Medical Institute, Mahidol University, Samut Prakan, Thailand
5. Department of Clinical Epidemiology and Biostatistics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
6. Departments of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
7. Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
8. Department of Physical Medicine & Rehabilitation, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
9. Department of Psychiatry & Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, Maryland, USA