[1] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore
[2] Yong Loo Lin Sch Med, Med Lib, Singapore, Singapore
[3] Natl Univ Singapore Hosp, Family Med Residency, 1E Kent Ridge Rd, Singapore 119228, Singapore
[4] Univ Liverpool, Marie Curie Palliat Care Inst, Liverpool, Merseyside, England
[5] Natl Canc Ctr Singapore, Div Support & Palliat Care, Singapore, Singapore
[6] Natl Univ Singapore, Ctr Biomed Eth, Singapore, Singapore
[7] Duke NUS Med Sch, Singapore, Singapore