1. University of Science and Technology of China; Hefei 230036 China
2. School of Management; Zhejiang University; Hangzhou Zhejiang 310058 China
3. School of Management; University of Science and Technology of China; Hefei 230036 China
4. Department of Decision Sciences; Western Washington University; Bellingham Washington 98225 USA
5. Beedie School of Business; Simon Fraser University; Burnaby, BC V5A 1S6 Canada