Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412xe2x80x8996 Gothenburg, Sweden.|Swedish NMR Centre, University of Gothenburg, SE-405?30 Gothenburg, Sweden.|Swedish NMR Centre, University of Gothenburg, SE-405?30 Gothenburg, Sweden.|Swedish NMR Centre, University of Gothenburg, SE-405?30 Gothenburg, Sweden.|Department of Laboratory Medicine.|Department of Medical Epidemiology and Biostatistics.|Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412xe2x80x8996 Gothenburg, Sweden.