Exa-cel in Children with Transfusion-Dependent β-Thalassemia or Sickle Cell Disease - Haydar Frangoul; Josu de la Fuente; Yogi Chopra; Roland Meisel; Persis J. Amrolia; Mattia Algeri; Akshay Sharma; Maria Domenica Cappellini; Selim Corbacioglu; Antonis Kattamis; Stephan Lobitz; Mariane De Montalembert; et al. (New England Journal of Medicine, 2026)