1. Department of Food and Nutrition, University of Helsinki, P.O. Box 66, (Agnes Sjöbergin Katu 2), Helsinki FI-00014, Finland
2. Department of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FI-00014, Finland
3. Department of Microbiology, University of Helsinki, P.O. Box 56, Helsinki FI-00014, Finland
4. Helsinki Institute of Sustainability Science (HELSUS), University of Helsinki, P.O. Box 65, Helsinki FI-00014, Finland