1. School of Economics and Management, Shijiazhuang Tiedao University, 15 Beierhuan East Road, Shijiazhuang 050043, China
2. School of Civil Engineering, Southeast University, 2 Southeast University Road, Nanjing 211189, China
3. Heinz College, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh 15213-3890, USA
4. School of Engineering and Technology, Central Queensland University, 400 Kent Street, Sydney, NSW 2000, Australia