1. Department of Anesthesiology, University of Heidelberg, Germany.
2. Department of Internal Medicine VII, Division of Sports Medicine, University of Heidelberg, Germany.
3. Department of Physiology, University of Glamorgan, UK.
4. Department of Medicine, Division of Pulmonary and Critical Care Medicine, University of Washington, Seattle, USA.
5. Department of Pathophysiology, University of Brussels, Belgium.