1 Department of Intensive Care, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland. Electronic address: carmen.pfortmueller@insel.ch.
2 First Department of Anaesthesiology and Intensive Therapy, Medical University of Lublin, Lublin, Poland.
3 First Department of Anaesthesiology and Intensive Therapy, Medical University of Lublin, Lublin, Poland; International Fluid Academy, Lovenjoel, Belgium; Medical Data Management, Medaman, Geel, Belgium.