[1] Univ Hong Kong, Sch Nursing, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Dept Social Work & Social Adm, Hong Kong, Hong Kong, Peoples R China
[3] Univ So Calif, Sch Social Work, Los Angeles, CA 90089 USA
[4] Univ Hong Kong, Sau Po Ctr Aging, Hong Kong, Hong Kong, Peoples R China