[1] Natl Inst Neurosci, Dept Neurol, Singapore 308433, Singapore
[2] Natl Inst Neurosci, Dept Nursing, Singapore 308433, Singapore
[3] Natl Univ Singapore Hosp, Dept Med, Div Neurol, Singapore, Singapore
[4] Natl Univ Singapore Hosp, Dept Med Affairs, Singapore, Singapore
[5] Alexandra Hosp, Dept Med, Athens, Greece
[6] Alexandra Hosp, Dept Nursing, Athens, Greece
[7] Tan Tock Seng Hosp, Dept Geriatr Med, Singapore, Singapore
[8] NHG Polyclin, Singapore, Singapore
[9] Yishun Polyclin, Singapore, Singapore
[10] Ang Mo Kio Polyclin, Singapore, Singapore
[11] Natl Helthcare Grp, Singapore, Singapore
[12] Dis Management Program, Singapore, Singapore