1. Institute of Social and Preventive Medicine, University of Zürich, Zurich, Switzerland.
2. Institute of Exercise and Health Sciences, University of Basel, Basel, Switzerland.
3. Swiss Society for Emergency Medicine, Bern, Switzerland.
4. Swiss Tropical and Public Health Institute, University of Basel, Basel, Switzerland.
5. Division of Cardiology, University Hospital Basel, Basel, Switzerland.
6. Pulmonary Division, University Hospital Zürich, Zurich, Switzerland.
7. Maastricht University Medical Centre, Cardiology, Maastricht, the Netherlands.