1. School of Physics, Engineering and Computer Science, University of Hertfordshire, Hatfield AL10 9AB, UK
2. Laboratory of Microbiology and Biotechnology of Foods, Department of Food Science and Human Nutrition, School of Food and Nutritional Sciences, Agricultural University of Athens, 11855 Athens, Greece
3. Videometer A/S, Hørkær 12B, 2730 Herlev, Denmark