1. Department of Information and Operations Management, Mays Business School Texas A&M University College Station Texas77843 USA
2. Project and Supply Chain Management Penn State Shenango Sharon Pennsylvania16146 USA
3. National Center for Electron Beam Research, College of Agriculture and Life Sciences Texas A&M University College Station Texas77845 USA
4. Department of Management Information Systems, Eller College of Management The University of Arizona Tucson Arizona85721 USA