1. Department of Industrial and Systems Engineering Virginia Tech 7054 Haycock Road, Room 430 Falls Church Virginia 22043 USA
2. Department of Industrial and Systems Engineering Virginia Tech 7054 Haycock Road, Room 433 Falls Church Virginia 22043 USA
3. Thomas Family Fellow in Business, Department of Management, College of Business California State University Chico. 400 West 1st St. Chico California 95973 USA