1. Graduate School of Economics, Soka University, Hachioji, Tokyo, Japan
2. Faculty of Business Administration, Soka University, Hachioji, Tokyo, Japan
3. Faculty of Economics, Soka University, Hachioji, Tokyo, Japan
4. Faculty of Nursing, Soka University, Hachioji, Tokyo, Japan
5. College of Business and Economics, Bahir Dar University, Bahir Dar, Ethiopia
6. College of Business and Economics, Injibara University, Injibara, Ethiopia
7. College of Agriculture and Environmental Sciences, Bahir Dar University, Bahir Dar, Ethiopia
8. Faculty of Science and Engineering, Soka University, Hachioji, Tokyo, Japan