1. Asia Research Institute, National University of Singapore, AS8, Level 7, 10 Kent Ridge Crescent Singapore 119260 Singapore
2. Fenner School of Environment and Society, College of ScienceThe Australian National University, Building 141, Linnaeus Way Canberra ACT 2601 Australia
3. Research Center for Rural DevelopmentAn Giang University, 18 Ung Van Khiem, Dong Xuyen Long Xuyen An Giang Vietnam