1. Department of Intensive Care Medicine Inselspital, Bern University Hospital Bern, Switzerland
2. Swiss Cave Rescue Organization (Spéléo-Secours Suisse) La Chaux-de-Fonds, Switzerland
3. Swiss Alpine Rescue Zürich Airport, Switzerland Air Glaciers SA Sion, Switzerland
4. Department of Intensive Care Medicine Kantonsspital Aarau Aarau, Switzerland
5. Department of Anesthesia Mobile Anesthesia Care Ltd Bulle, Switzerland
6. Department of Anesthesiology and Perioperative Medicine Hospital of Valais Sion, Switzerland