[1] Ng Teng Fong Gen Hosp, Dept Nutr & Dietet, Singapore, Singapore
[2] Univ Malaya, Dept Anesthesiol, Fac Med, Kuala Lumpur 50603, Malaysia
[3] Rigshosp, Copenhagen Trial Unit, Ctr Clin Intervent Res, Copenhagen Univ Hosp,Capital Reg, Copenhagen, Denmark
[4] Univ Southern Denmark, Dept Reg Hlth Res, Fac Hlth Sci, Odense, Denmark