1. Graduate School of Humanities and Social Science, Hiroshima University, Higashihiroshima 739-8529, Japan
2. National Statistics Office, Kathmandu 44600, Nepal
3. The IDEC Institute, Hiroshima University, Higashihiroshima 739-8529, Japan
4. Graduate School of Innovation and Practice for Smart Society, Hiroshima University, Higashihiroshima 739-8529, Japan
5. Network for Education and Research on Peace and Sustainability (NERPS), Hiroshima University, Higashihiroshima 739-8529, Japan