1. Department of Internal Medicine V—Pulmonology, Allergology and Critical Care Medicine, Saarland University, Homburg, Germany
2. Institute of Medical Microbiology and Hygiene, Saarland University, Homburg, Germany
3. Department of Internal Medicine IV, Saarland University Medical Centre, Homburg, Germany
4. Institute of Anatomy and Cell Biology, Saarland University, Homburg, Germany