1. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Bern, Switzerland
2. University of Basel, Bern, Switzerland
3. Basel Institute for Clinical Epidemiology and Biostatistics, University Hospital Basel, Bern, Switzerland
4. Department of Cardiac Surgery, University Hospital Basel, Bern, Switzerland
5. Swissnoso, National Center for Infection Prevention, Bern, Switzerland