1. School of Transportation and Civil Engineering and Architecture, Foshan University, No. 33, Guangyun Road, Shishan Town, Nanhai District, Foshan, Guangdong, P. R. China
2. School of Civil Engineering and Transportation, South China University of Technology, No. 381, Wushan Road, Tianhe District, Guangzhou, Guangzhou, Guangdong, P. R. China