1. Department of Information Systems and Operations Management; Warrington College of Business Administration; University of Florida; Gainesville Florida 32611-7169 USA
2. Department of Information Management and Electronic Commerce; School of Management; Xi'an Jiao Tong University; Xi'an Shaanxi 710049 China
3. Department of Operations Management and Information Systems; College of Business; Northern Illinois University; DeKalb Illinois 60115 USA