[1] Natl Canc Ctr Singapore, Dept Med Oncol, Singapore, Singapore
[2] Changi Gen Hosp, Dept Internal Med, Singapore, Singapore
[3] Sengkang Gen Hosp, Dept Intens Care Med, Singapore, Singapore
[4] Singapore Armed Forces, Changi Naval Base, Singapore, Singapore
[5] Tan Tock Seng Hosp, Dept Gen Med, Singapore, Singapore
[6] Singapore Armed Forces, Tekong Isl Med Ctr, Singapore, Singapore
[7] Changi Gen Hosp, Dept Gen Surg, Singapore, Singapore
[8] Singapore Gen Hosp, Dept Internal Med, Singapore, Singapore
[9] Natl Univ Singapore, Natl Univ Hosp, Yong Loo Lin Sch Med, Dept Med, Singapore, Singapore
[10] Khoo Teck Puat Hosp, Populat Hlth & Community Transformat, Singapore, Singapore
[11] Duke NUS Med Sch, Hlth Serv & Syst Res, Singapore, Singapore
[12] Khoo Teck Puat Hosp, Dept Geriatr Med, Singapore, Singapore
[13] Geriatr Educ & Res Inst, Singapore, Singapore
[14] Natl Univ Singapore, Natl Univ Hlth Syst, Yong Loo Lin Sch Med, Singapore 117549, Singapore
[15] Natl Univ Singapore, Saw Swee Hock Sch Publ Hlth, Singapore 117549, Singapore