1 Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore.
2 Department of Anesthesia and Surgical Intensive Care, Singapore General Hospital, Singapore, Republic of Singapore; Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Graduate Medical School, Singapore, Republic of Singapore.
3 Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore; Department of Anesthesia, National University Health System, Singapore, Republic of Singapore.