1. School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China
2. Department of Construction Management and Real Estate, Tongji University, Shanghai 200092, China
3. School of Architecture & Built Environment, The University of Adelaide, Adelaide 5001, Australia
4. Department of Civil Engineering and Engineering Mechanics, Columbia University, New York 10027, USA
5. School of Economics and Statistics, Guangzhou University, Guangzhou 510006, China