1. Department of Building and Markets, Norwegian Institute of Wood Technology, Forskningsveien 3B, P.O. Box 113 Blindern, 0314 Oslo, Norway
2. Department of Civil Engineering and Energy Technology, Oslo and Akershus University College of Applied Sciences, Oslo, Norway
3. Department of Public Health, Hedmark University of Applied Sciences, Elverum, Norway
4. SP Technical Research Institute of Sweden, Stockholm, Sweden
5. Department of Mathematical Sciences, Norwegian University of Life Sciences, Ås, Norway