Institution: | 1. Graduate School Hiroshima University of Economics, 5-37-1 Gion, Asaminami, 731-0138, Japan 2. Department of International Business Management, Beppu University, 82 Kita-ishigaki, Beppu, 874-8501, Japan 3. Department of Statistics, Seoul National University, Seoul, Korea 4. Hiroshima University of Economics, 5-37-1 Gion, Asaminami, 731-0138, Japan
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