1. Assistant Professor, Dept. of Civil Engineering, School of Architecture and Civil Engineering, Xiamen Univ., Siming District, Xiamen, Fujian 361000, China. ORCID: .
2. Senior Economist, Tianjin Rail Transit Group Co. Ltd., No. 36 Caizhi Rd., Xiqing District, Tianjin 300392, China (corresponding author).