1. Leibniz Institute of Agricultural Development in Transition Economies (IAMO), Halle (Saale), Germany
2. College of Economics, Sichuan Agricultural University, Chengdu, Sichuan Province, China
3. Institute of Agricultural Policy and Market Research, Justus Liebig University Giessen, Giessen, Germany
4. Institute of Agricultural Economics, University of Kiel, Kiel, Germany