1 From the Department of Anaesthesia and Intensive Care, University Hospital Waterford, Waterford (PB), Department of Anaesthesia and Intensive Care, Cork University Hospital, Cork, Ireland (BO), Centre for Addiction and Mental Health, Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada (PD), and Department of Anaesthesia and Critical Care, All India Institute of Medical Sciences, Raipur, Chhattisgarh, India (HRK).