1. Department of Forestry, Ministry of Agriculture and Forestry, Xiengyuen Village, Chanthaboury District, Vientiane P.O. Box 2932, Laos
2. Institute of Tropical Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
3. Institute for Global Environmental Strategies (IGES), 2108-11 Kamiyamaguchi, Hayama, Kanagawa 240-0115, Japan