1. Maine Business School, University of Maine, Orono, ME, USA
2. Department of Agricultural Economics, Purdue University, West Lafayette, IN, USA
3. School of Economics, Rural Revitalization Research Institute in Karst Region of China and Guizhou Grassroots Social Governance Innovation High End Think Tank, Guizhou University, Guiyang, China
4. Medical School, University of Michigan, Ann Arbor, MI, USA