1. 2.-0 LCA consultants, Skibbrogade, 5, 1, 9000 Aalborg, Denmark
2. Bioclear, Rozenburglaan 13, 9727 DL Groningen, The Netherlands
3. Department of Geochemistry, Geological Survey of Denmark & Greenland, Øster Voldgade 10, DK-1350, Copenhagen, Denmark