1. Laboratory of Microbiology; Department of Clinical Laboratories; School of Medicine; Pontifical Catholic University of Chile; Santiago 8331010 Chile
2. Department of Medicine; University of Tennessee Health Science Center and the Department of Veterans Affairs Medical Center; Memphis, TN 38163 USA
3. Department of Molecular Genetics and Microbiology; School of Biological Sciences; Millennium Institute on Immunology and Immunotherapy; Pontifical Catholic University of Chile; Santiago 8331010 Chile
4. Department of Endocrinology; School of Medicine; Pontifical Catholic University of Chile; Santiago 8331010 Chile