1. Laboratorio de Antibióticos, Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
2. Millennium Nucleus for Collaborative Research on Bacterial Resistance, Santiago, Chile
3. Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Concepción, Chile
4. Department of Restorative School of Dentistry, University of Concepción, Concepción, Chile
5. Grupo de Resistencia Antibacteriana en Bacterias Patógenas Ambientales GRABPA, Instituto de Biología, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
6. Departamento de Ciencias Biológicas y Químicas, Facultad de Medicina y Ciencia, Universidad San Sebastián, Concepción, Chile
7. Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
8. Department of Clinical Analysis, School of Pharmacy, University of São Paulo, São Paulo, Brazil
9. Hospital Hernán Henríquez Aravena, Clinical Laboratory, Temuco, Chile