1. Department of Cardiology, University Medical Center Groningen, University of Groningen, 9713 AV Groningen, Netherlands.
2. Department of Pharmacy, Analytical Biochemistry, University of Groningen, 9713 AV Groningen, Netherlands.
3. National Heart Centre Singapore, 169609 Singapore, Singapore.
4. European Research Institute for the Biology of Aging, Laboratory of Stem Cell Regulation and Mechanisms of Regeneration, University of Groningen, 9713 AV Groningen, Netherlands.
5. Cardiovascular Research Center, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
6. Harvard Stem Cell Institute, Cambridge, MA 02138, USA.
7. Molecular Genetics Section, Department of Pediatrics, University Medical Center Groningen, University of Groningen, 9713 AV Groningen, Netherlands.
8. Department of Pediatrics, Mayo Clinic, Rochester, MN 55905, USA.