1. Department of Medicine, Lundquist Institute, Torrance, CA 90502, USA
2. Centro Cardiologico Monzino, IRCCS, 20138 Milan, Italy
3. Department of Clinical Sciences and Community Health, Cardiovascular Section, University of Milan, 20126 Milan, Italy
4. Department of Medical Imaging, The Prince Charles Hospital, Brisbane, 4032 QLD, Australia