1. Department of Anesthesiology , Maharaj Nakorn Chiang Mai Hospital , Chiang Mai University , Chiang Mai 50200 , Thailand
2. Department of Anesthesiology , UF Health , University of Florida College of Medicine , Gainesville , FL 32209 , USA
3. Department of Anesthesia , Montreal General Hospital , McGill University , Montréal , QC H3G 1A4 , Canada
4. Department of Anesthesia , Royal Victoria Hospital , McGill University , Montréal , QC H4A 3J1 , Canada