1. Robert Koch Institute, Department for Infectious Disease Epidemiology, Berlin, Germany
2. University Medicine Greifswald, Greifswald, Germany
3. National Reference Centre for multidrug-resistant Gram-negative bacteria, Ruhr University Bochum, Bochum, Germany
4. Robert Koch Institute, Division of Nosocomial Pathogens and Antibiotic Resistance, Wernigerode, Germany
5. Regional Public Health Authority Mecklenburg-Western Pomerania, Rostock, Germany
6. Institute of Pharmacy, University of Greifswald, Greifswald, Germany
7. Robert Koch Institute, Genome Sequencing Unit, Berlin, Germany