Peking University, Peking University, Peking University, Peking University, Peking University - China Center for Health Development Studies, London School of Economics & Political Science (LSE) - Care Policy and Evaluation Centre, Duke University - Center for the Study of Aging and Human Development, University College London - Department of Mental Health of Older People, University College London - Department of Mental Health of Older People, University of New South Wales (UNSW) - School of Psychology and Peking University - China Center for Health Development Studies