1. Department of Anesthesiology and General Intensive Care and Pain Therapy, Medical University of Vienna, Vienna, Austria.
2. Department of Anesthesiology and General Intensive Care, General Hospital Wr. Neustadt; Austria.
3. OEAMTC Christophorus Air Rescue Service, Austria.
4. Department of Anesthesiology and Critical Care Medicine, AUVA Trauma Center, Salzburg, Austria.
5. Department of Anesthesiology, Washington University, St. Louis, Missouri.