1. Department of Social Sciences, Qatar University, Doha P.O. Box 2713, Qatar
2. Department of Sociology & Anthropology, Utah State University, Logan, UT 84322, USA
3. Department of Agricultural Economics, Oklahoma State University, Stillwater, OK 74078, USA
4. Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007, USA