1. Department of Anesthesiology and Intensive Therapy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University of Torun, Torun, Poland.
2. Department of Anesthesiology and Intensive Therapy, Poznan University of Medical Sciences, Poznan, Poland.
3. Department of General Anesthesiology, Cleveland Clinic, Cleveland, OH, USA.