1. Department of Anaesthesiology, Intensive Therapy and Pain Treatment, Poznan University of Medical Sciences, 60-355 Poznan, Poland
2. Department of Teaching Anaesthesiology and Intensive Therapy, Poznan University of Medical Sciences, 61-861 Poznan, Poland
3. Central Microbiology Laboratory, Clinical Hospital at the Poznan University of Medical Sciences, 60-355 Poznan, Poland
4. Center for Advanced Technology, Adam Mickiewicz University, 61-614 Poznan, Poland