1. Division of Cardiology and Department of Medicine, University of Maryland, Baltimore, Maryland;
2. Cardiovascular Medicine Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts;
3. Department of Biochemistry and Molecular Biology, University of South Alabama, College of Medicine, Mobile, Alabama;
4. Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania; and
5. Institute of Life Sciences, Scuola Superiore Sant'Anna, Pisa, Italy