1. School of Life Sciences Weihenstephan, Technical University Munich, Alte Akademie 12, Freising 85354, Germany
2. Department of Agricultural, Environmental and Food Policy, Martin-Luther-University Halle-Wittenberg, Halle (Saale) D-06099, Germany
3. Leibniz Institute of Agricultural Development in Transition Economies (IAMO), Theodor-Lieser-Str.2, Halle (Saale) 06120, Germany
4. Agriculture Faculty, Agricultural and Resource Economics, Kasetsart University, 50 Pahonyotin Road, Chatuchak, Bangkok 10900, Thailand