1. Department of Social Welfare, Sungkyunkwan University, Seoul 03063, Republic of Korea
2. School of Social Work, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
3. School of Social Work and Family Sciences, The University of Akron, Akron, Ohio 44325, USA
4. Independent Researcher of Co-Research Coop, Seoul 08807, Republic of Korea