1. School of Economics, Qingdao University, Qingdao, Shandong, China; Faculty of Economics and Business Administration, West University of Timisoara, Timisoara, Romania
2. School of Economics, Qingdao University, Qingdao, Shandong, China
3. Department of Finance, Feng Chia University, Taichung, Taiwan
4. School of Economics, Qingdao University, Qingdao, Shandong, China; Adnan Kassar School of Business, Lebanese American University, Chouran, Beirut, Lebanon