1. Biomedical Laboratory, University of Southern Denmark, Winsloewparken 23, DK-5000 Odense C, Denmark, Department of Food Science, Danish Institute of Agricultural Sciences, Research Centre Aarslev, Kirstinebjergvej 10, DK-5792 Aarslev, Denmark, Department of Statistics, University of Southern Denmark, Sdr. Boulevard 23A, DK-5000 Odense C, Denmark, and School of Agriculture, Food and Rural Development, University of Newcastle upon Tyne, Agriculture Building, Newcastle upon Tyne NE1 7RU, United Kingdom