1 From the Anesthesiology Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, UAE (CL), Department of Anaesthesiology, Intensive Care and Pain Therapy, Saarland University Medical Center and Saarland University Faculty of Medicine, Homburg/Saar, Germany (TV) and Department of Anaesthesia and Intensive Care, Evangelical Hospital Vienna and Sigmund Freud Private University, Vienna, Austria (SK).