1. Departamento de Microbiología II, Facultad de Farmacia; Universidad Complutense de Madrid, IRYCIS; 28040 Madrid Spain
2. Institute of Chemistry, Center for Glycomics; Department of Glycobiology, Slovak Academy of Sciences; 84538 Bratislava Slovakia
3. Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health; Department of Health and Human Services; Bethesda MD USA