1. Faculty of Economics and Business Management, Tezukayama University, Nara, Japan
2. Research institute for socio-network strategies, Kansai University, Osaka, Japan
3. Faculty of System Engineering and Science, Shibaura Institute of Technology, Saitama, Japan
4. College of Comprehensive Psychology, Ritsumeikan University, Osaka, Japan
5. Faculty of Economics, Kansai University, Osaka, Japan
6. Faculty of Sociology, Kansai University, Osaka, Japan