1. Department of Economics, Program for the Study of Midwest Markets and Entrepreneurship (PSMME), Center for Agricultural and Rural Development (CARD) Iowa State University Ames Iowa USA
2. Global Labor Organization (GLO) Essen Germany
3. Institute of Labor Economics (IZA) Bonn Germany
4. Institute of Development Studies Southwestern University of Finance and Economics Chengdu Sichuan China
5. Department of Economics Oklahoma State University Stillwater Oklahoma USA