Tissue Doppler imaging in the left ventricle and right ventricle in healthy children: normal age-related peak systolic velocities, timings, and time differences
Division of Pediatric Cardiology, Department of Pediatrics, J6-S Leiden University Medical Center, Albinusdreef 2, PO Box 9600, 2300 RC Leiden, The Netherlands. a.e.van_der_hulst@lumc.nl