Matthias Nahrendorf1, Antonio Abbate2, Jagat Narula3. 1. Massachusetts General Hospital, Harvard Medicial School, Boston, MA, USA. 2. VCU Pauley Heart Center, Virginia Commonwealth University, Richmond, VA, USA. 3. Mount Sinai Morningside Hospital, Icahn School of Medicine at Mount Sinai, 421 W. 113th Street, Suite 130, New York, NY, 10025, USA. narula@mountsinai.org.