1. College of Management and Economics, Tianjin University, Tianjin, People’s Republic of China
2. School of Management Science and Engineering, Tianjin University of Finance and Economics, Tianjin, People’s Republic of China
3. School of Economics and Management, China University of Petroleum (Huadong), Qingdao, People’s Republic of China
4. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education, Tianjin, People’s Republic of China