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Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Epidemiol & Publ Hlth, Singapore 117595, Singapore
Natl Univ Singapore, Yong Loo Lin Sch Med, Ctr Hlth Serv Res, Singapore 117595, Singapore Alexandra Hosp, Dept Geriatr Med, Singapore 159964, Singapore