1. Associate Professor, School of Economics and Management, Beijing Jiaotong Univ., Beijing 100044, China.
2. Professor, School of Economics, Qingdao Univ., Qingdao, Shandong 266071, China.
3. Professor, Dept. of Accounting and Information, Ling Tung Univ., Taichung 406, Taiwan.
4. Associate Professor, Dept. of Finance, Business School, Shantou Univ., No. 243 Da Xue Rd., Jingping District, Shantou, Guangdong 515063, China (corresponding author).