1 Clinic for Anaesthesia, Intermediate Care, Prehospital Emergency Medicine and Pain Therapy, University Hospital Basel, University of Basel, Basel, Switzerland. Electronic address: daniel.bolliger@usb.ch.
2 Clinic for Anaesthesia, Intermediate Care, Prehospital Emergency Medicine and Pain Therapy, University Hospital Basel, University of Basel, Basel, Switzerland.
3 Department of Anesthesiology and Pain Medicine, Inselspital/University Hospital Bern, Bern, Switzerland.