1. Baylor Heart and Vascular Institute, Baylor University Medical Center, Dallas, TX (M.P.).
2. Imperial College, London, UK (M.P.).
3. Université de Lorraine, Inserm INI-CRCT, CHRU, Nancy, France (F.Z.).
4. Department of Cardiology (CVK) and Berlin Institute of Health Center for Regenerative Therapies, German Centre for Cardiovascular Research Partner Site Berlin, Charité Universitätsmedizin, Germany (S.D.A.).