http://orcid.org/0000-0003-4860-7007
About the Authors
- Kazumi Shimizu
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Contributed equally to this work with: Kazumi Shimizu, Daisuke Udagawa
Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Supervision, Writing – original draft, Writing – review & editing
* E-mail: skazumi1961@gmail.com.
Affiliation Department of Political Science and Economics, Waseda University, Shinjukuku, Tokyo, Japan
- Daisuke Udagawa
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Contributed equally to this work with: Kazumi Shimizu, Daisuke Udagawa
Roles Data curation, Investigation, Methodology
Affiliation Faculty of Economics, Hannan University, Amamihigashi Matsubara, Osaka Japan
Competing Interests
The authors have declared that no competing interests exist.