• e-Media Research Lab, ESAT-STADIUS Division, KU Leuven, 3000 Leuven, Belgium• University of Gävle, 801 76 Gävle, Sweden• Division of Human Nutrition and Health, Department of Agrotechnology and Food Sciences, Wageningen University and Research, 6700EA Wageningen, The Netherlands• M-Group, DistriNet, Department of Computer Science, KU Leuven, 8200 Sint-Michiels, Belgium