1. Dept. of Civil, Environmental and Natural Resources Engineering, Lulea Univ. of Technology, 971 87 Lulea, Sweden; Technical Writer, S-Group Solutions, Jungmansgatan, 12211 19 Malmö, Sweden.
2. Associate Professor, Dept. of Civil, Environmental and Natural Resources Engineering, Lulea Univ. of Technology, 971 87 Lulea, Sweden (corresponding author).
3. Professor, Dept. of Engineering Sciences and Mathematics, Lulea Univ. of Technology, 971 87 Lulea, Sweden.
4. Adjunct Professor, Dept. of Civil, Environmental and Natural Resources Engineering, Lulea Univ. of Technology, 971 87 Lulea, Sweden.
5. Professor, Dept. of Civil, Environmental and Natural Resources Engineering, Lulea Univ. of Technology, 971 87 Lulea, Sweden.