1. MATFORSK, Norwegian Food Research Institute, N-1430 Ås, and Biotechnology Centre of Oslo, University of Oslo, Norway
2. Institute for Nutrition Research, University of Oslo, N-0316 Oslo, Norway
3. Medical Department A, Rikshospitalet, N-0027 Oslo, Norway
4. Medical Department, University Hospital of Tromsø, N-9012 Tromsø, Norway