1. School of Automation, Chongqing University, Chongqing, China
2. Department of Civil Engineering, The University of Hong Kong, Hong Kong, China
3. School of Economics and Finance, University of the Witwatersrand, Johannesburg, South Africa
4. School of Civil Engineering, Chongqing University, Chongqing, China
5. College of Civil Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, China