1. University of Iowa Hospitals and Clinics , Iowa City, IA , USA
2. British Heart Foundation Centre of Research Excellence, University of Edinburgh , The Chancellor's Building, Little France Crescent, Edinburgh EH26 0NL , UK
3. Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam , Meibergdreef 9, 1105 AZ Amsterdam , The Netherlands
4. Departments of Biomedical Sciences and Medicine, Cedars-Sinai Medical Center, Biomedical Imaging Research Institute , Los Angeles, CA , USA