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Ralf J. Holzer, MD, MSc, is Assistant Director of Cardiac Catheterization and Interventional Therapy at The Heart Center at Nationwide Children's Hospital. He is Associate Professor of Clinical Pediatrics at The Ohio State University College of Medicine. Dr. Holzer received his medical degree from Johannes Gutenberg Universitat Mainz in Germany. After completing his residency, he received fellowship training at Royal Liverpool Children’s NHS Trust in England and University of Chicago Children’s Hospital.