1. National and Kapodistrian University of Athens, School of Medicine, Attikon University Hospital, Greece (G.F.).
2. Richard L. Roudebush VA Medical Center and Indiana University, Indianapolis (R.A.).
3. Department of Medicine, University of Chicago Medicine, IL (G.B.).
4. Department of Cardiology (CVK) and Berlin Institute of Health Center for Regenerative Therapies, German Centre for Cardiovascular Research Partner Site Berlin, Charité Universitätsmedizin (S.A.).