1. Department of Cardiology and Pneumology; University Hospital Göttingen; Robert-Koch-Straße 40 D-37075 Göttingen Germany
2. Cancer Research UK Health Behaviour Research Centre; University College London; London UK
3. Department of Anesthesiology and Intensive Care Medicine; Campus Virchow Klinikum and Campus Charité Mitte; Charité-Universitätsmedizin Berlin; Berlin Germany