1. Department of Anaesthesiology and Pain Medicine (K.F., D.P.G., I.K., B.E.), Inselspital, Bern University Hospital, University of Bern, Switzerland.
2. Research Institute of the McGill University Health Centre, Montreal, QB, Canada (K.F.).
3. Department of Diagnostic, Interventional‚ and Paediatric Radiology (D.P.G., B.J., H.v.T.-K.), Inselspital, Bern University Hospital, University of Bern, Switzerland.
4. Departments of Medicine and Diagnostic Radiology, McGill University Health Centre, Montreal, QB, Canada (N.G., M.G.F.).
5. Department of Family Medicine, McGill University, Montreal, QB, Canada (M.G.F.).
6. Departments of Cardiac Sciences and Radiology, University of Calgary, AB, Canada (M.G.F.).