1 Department of Geriatric Medicine, Tan Tock Seng Hospital, Singapore; Institute of Geriatrics and Active Ageing, Tan Tock Seng Hospital, Singapore.
2 Department of General Medicine (Geriatric Medicine), Sengkang Hospital, Singapore.
3 Institute of Geriatrics and Active Ageing, Tan Tock Seng Hospital, Singapore.
4 Institute of Geriatrics and Active Ageing, Tan Tock Seng Hospital, Singapore; Department of Continuing and Community Care, Tan Tock Seng Hospital, Singapore.