1. Institute of Medical Microbiology and Hygiene, University of Saarland Hospital, 66421 Homburg/Saar, Germany
2. Department of Microbial Drugs, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, 38124 Braunschweig, Germany
3. Pharmaceutical and Medicinal Chemistry, Saarland University, Campus C23, 66123 Saarbrücken, Germany