1. Department of Microbiology and Biochemistry of Dairy Products, Instituto de Productos Lácteos de Asturias (IPLA), Consejo Superior de Investigaciones Científicas (CSIC), Villaviciosa, Asturias, Spain
2. Department of Physiology, Cultures and Enzymes Division, Chr. Hansen A/S, Hørsholm, Denmark
3. Department of Microbiology and Alimentary Pharmabiotic Centre, University College Cork, Cork, Ireland