1. Laboratorio de Investigación en Agentes Antibacterianos, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile
2. Millennium Nucleus for Collaborative Research on Bacterial Resistance, Chile
3. Departamento de Farmacia, Universidad de Concepción, Concepción, Chile
4. Department of Microbiology, Institute of Biomedical Sciences, Universidade de São Paulo, São Paulo, Brazil
5. Department of Clinical Analysis, School of Pharmacy, Universidade de São Paulo, São Paulo, Brazil
6. Unidad de Microbiología, Hospital Dr. Hernan Henriquez Aravena, Temuco, Chile
7. Laboratorio de Microbiologia, Hospital de Puerto Montt, Puerto Montt, Chile