1. School of Economics and Management, Yunnan Normal University, Kunming 650500, Yunnan, China
2. International Business School, Yunnan University of Finance and Economics, Kunming 650221, China
3. School of Logistics, Yunnan University of Finance and Economics, Kunming 650221, China
4. School of International Trade and Economics, University of International Business and Economic, Beijing 100029, China
5. Business School, Yunnan University of Business Management, Kunming 650106, China