1. Department of Genetics, Biology of Microorganisms, Anthropology and Evolution, University of Parma, Parco Area delle Scienze 11a, 43100 Parma, Italy
2. Department of Biochemistry, Genetics and Immunology, Universidad de Vigo, 36310 Vigo, Spain
3. Department of Microbiology and Biochemistry of Dairy Products, Instituto de Productos Lácteos de Asturias (IPLA-CSIC), 33300 Villaviciosa, Asturias, Spain