RecruitingPhase 3Biological interventionAn Efficacy and Safety Study of Intravenous Anifrolumab to Treat Systemic Lupus Erythematosus in Pediatric ParticipantsA Study to Evaluate the Pharmacokinetics (PK), Pharmacodynamics (PD), Efficacy, and Safety of Anifrolumab in Children with Moderate to Severe Active Systemic Lupus Erythematosus (SLE)