1. Edward R. Roybal Institute on Aging, University of Southern California, Los Angeles, CA, USA
2. Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, USA
3. Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA
4. Daniel J. Epstein Department of Industrial and Systems Engineering, University of Southern California, Los Angeles, CA, USA
5. Department of Social Welfare, Ewha Womans University, Seoul, Republic of Korea