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JN, IB-D and US are joint senior authors.
Contributors Concept and design: FG, JN, IB-D and US; collection of patient-derived samples: FG, PLL and DJK; establishment of procedures/protocols and performance of experiments: FG, BK, CF, HDN, RG and MP; analysis of data: FG, PM, TRL and US; interpretation and integration of data: FG, PM, TRL, AMcH, JN, IB-D and US; writing of the manuscript: FG, PLL, JN, IB-D and US; supervision: AMcH, CS, AH, JN, IB-D and US; all authors proofread the final version of the manuscript.
Funding FG received a 'clinical leave stipend' by the German Center for Infection Research between August 2014 and February 2016.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, conduct, reporting or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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