1. IRTA-Food Safety Programme, Finca Camps i Armet, 17121 Monells, Girona, Spain
2. Department of Microbiology and Biochemistry of Dairy Products, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas (IPLA-CSIC), Paseo Río Linares s/n, 33300 Villaviciosa, Asturias, Spain