A 52-week Randomized, Double-blind, Placebo-controlled, Multi-center Phase 2b Study With a 52-week Blinded Extension and an Optional Open-label Extension - Assessing Safety and Efficacy of Frexalimab, a CD40L-antagonist Monoclonal Antibody, for Preservation of Pancreatic β-cell Function in Adults and Adolescents With Newly Diagnosed Type 1 Diabetes on Insulin Therapy | Arctuva