1. School of Science and Technology, Singapore University of Social Sciences, 463 Clementi Rd., Singapore, 599494, https://orcid.org/0000-0003-1511-2438
2. School of Civil and Environmental Engineering, Nanyang Technological University, Blk. N1, 50 Nanyang Ave., Singapore, 639798 (Corresponding author), e-mail: cecleong@ntu.edu.sg, https://orcid.org/0000-0002-0941-0984