1. Industrial and Systems Engineering Department; Rensselaer Polytechnic Institute; 110 8th Street Troy NY 12180 USA
2. Department of Public Administration; University of North Texas; 204N Chilton Hall, 410 Avenue C Denton TX 76201 USA
3. Department of Sociology; University of California - Irvine; SSPA 2145 Irvine CA 92697 USA