1. Department of Applied Mathematics and Computational Sciences, University of Cantabria, 39005 Santander, Spain
2. Department of Computer Science and Mathematics, University of Rovira i Virgili, 43007 Tarragona, Spain
3. Department of Civil Engineering, The University of Hong Kong, 999077 Pok Fu Lam, Hong Kong
4. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, 999077 Sai Kung District, Hong Kong