1. Centre for Development and Environment (CDE), University of Bern, Bern, Switzerland
2. SENS (IRD, CIRAD, University Paul Valery Montpellier 3), University of Montpellier, Montpellier, France
3. Faculty of Agriculture, National University of Laos, Vientiane, Lao PDR
4. Department of Agricultural Land Management, Ministry of Agriculture and Forestry, Vientiane, Lao PDR