1. Anesthesia Section, Department of Cardiothoracic and Vascular Surgery, Aarhus University Hospital, Aarhus N, Denmark.
2. Research Center for Emergency Medicine, Aarhus University Hospital, Aarhus N, Denmark.
3. Department of Otolaryngology, Head and Neck Surgery, Aarhus University Hospital, Aarhus N, Denmark.
4. Department of Clinical Medicine, Aarhus University, Aarhus N, Denmark.
5. Department of Intensive Care Medicine, Aarhus University Hospital, Aarhus N, Denmark.
6. Faculty of Health, Aarhus University, Aarhus C, Denmark.