[1] Tan Tock Seng Hosp, Yong Loo Lin Sch Med, Dept Anaesthesiol Intens Care & Pain Med, Singapore, Singapore
[2] Lee Kong Chian Sch Med, Singapore, Singapore
[3] Tan Tock Seng Hosp, Dept Haematol, Yong Loo Lin Sch Med, Lee Kong Chian Sch Med, Singapore, Singapore
[4] Khoo Teck Puat Hosp, Dept Lab Med, Singapore, Singapore
[5] Tan Tock Seng Hosp, Yong Loo Lin Sch Med, Dept Cardiol, Singapore, Singapore