1. Department of Applied Social Sciences, City University of Hong Kong, Kowloon, Hong Kong
2. Department of Statistics and Actuarial Science, University of Hong Kong, Hong Kong City, Hong Kong
3. Department of Social Work and Social Administration, University of Hong Kong, Hong Kong City
4. Sau Po Centre on Aging, University of Hong Kong, Hong Kong City, Hong Kong
5. School of Social Work, University of Southern California, Los Angeles, CA, USA