1. The United Graduate School of Agricultural Sciences, Kagoshima University, Korimoto 1-21-24, Kagoshima 890-0065, Japan
2. The Department of Agricultural Extension, Faculty of Agriculture, University of Peradeniya, Peradeniya 20400, Sri Lanka
3. Department of Regional Development and Management Studies, Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
4. United Nations Development Programme, UN Compound 202–204, Bauddhaloka Mawatha, Colombo 07 00700, Sri Lanka