1. Institutes of1Physiology and
2. Department of Cardiovascular Medicine, University of Greifswald, Greifswald;
3. Institute of Pathology, University of Veterinary Medicine Hannover, Hannover;
4. Max Delbrück Center for Molecular Medicine, Berlin-Buch, Germany; and
5. Diagnostic Radiology and Neuroradiology,
6. Molecular Physiology Laboratory, University of Edinburgh, Edinburgh, United Kingdom