1. Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany.
2. Department of Radiology and Neuroradiology, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany.
3. Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Therapy, Armed Forces Hospital, Ulm, Germany.
4. Emergency Medicine, Institute for Emergency Medicine, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany.
5. Department of Anesthesiology and Intensive Care Medicine, Amalie Sieveking Hospital, Hamburg, Germany.
6. Medical Service, German Air Rescue Service Association “DRF Luftrettung,” Filderstadt, Germany.