Gene Therapy Animation (VIDEO) Nationwide Children's Hospital This video is under embargo. Please login to access this video. Caption Learn how a one-time intravenous infusion of the high dose of gene therapy extended the survival of patients with spinal muscular atrophy type 1 (SMA1) in a Phase 1 clinical trial. Credit Nationwide Children's Hospital Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.