1. Graduate School, Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Japan
2. Graduate School of Global Environmental Studies, Kyoto University, Kyoto, Japan
3. Faculté d’ Agronomie, Université de Dschang, Dschang, Cameroon
4. Graduate School of Asian and African Area Studies, Kyoto University, Kyoto, Japan
5. Graduate School of Urban Environmental Science, Tokyo Metropolitan University, Hachioji, Japan
6. Graduate School of Agriculture, Kyoto University, Kyoto, Japan