1. School of Marxism, Qingdao University, Qingdao, Shandong, China; Doctoral School of Economics and Business Administration, West University of Timisoara, Timisoara, Romania
2. School of Business, Wuchang University of Technology, Wuchang, China
3. School of Finance, Yunnan University of Finance and Economics, Kunming, Yunnan, China; School of Economics, Qingdao University, Qingdao, Shandong, China
4. Doctoral School of Economics and Business Administration, West University of Timisoara, Timisoara, Romania