1. University Clinic of Anesthesia, Innsbruck Medical University, Innsbruck, Austria
2. Breath Research Institute of the Austrian Academy of Sciences, Dornbirn, Austria
3. Department of Hygiene, Microbiology and Social Medicine, Division of Hygiene and Medical Microbiology, Innsbruck Medical University, Innsbruck, Austria
4. Daniel-Swarovski Research Laboratory, Department of Visceral, Transplant and Thoracic Surgery, Innsbruck Medical University, Innsbruck, Austria