1 Department of Anaesthesiology, Intensive Care and Pain Medicine, Tan Tock Seng Hospital, Singapore, Yong Loo Lin School of Medicine, Singapore, and Lee Kong Chian School of Medicine, Singapore.
2 Department of Haematology, Tan Tock Seng Hospital, Singapore, Yong Loo Lin School of Medicine, Singapore, Lee Kong Chian School of Medicine, Singapore, and Department of Laboratory Medicine, Khoo Teck Puat Hospital, Singapore.
3 Department of Cardiology, Tan Tock Seng Hospital, Singapore, Yong Loo Lin School of Medicine, Singapore, and Lee Kong Chian School of Medicine, Singapore.