Age-specific determinants of reduced exercise capacity in youth after heart transplant: A longitudinal cohort study oleh N.D. Markiewitz, MD, MA, M. Lane-Fall, MD, MSHP, J. Huang, PhD, L. Mercer-Rosa, MD, MSCE, K. Stack, MD, J. Mitchell, PhD, M.J. O’Connor, MD, J.W. Rossano, MD, MS, S. Paridon, MD, D.S. Burstein, MD, MSCE, J.B. Edelson, MD