Phase IIIb, open-label, single-arm, multi-center study to evaluate the safety, tolerability and efficacy of OAV101 administered intrathecally (1.2 x 1014 vector genomes) to participants 2 to < 18 years of age with spinal muscular atrophy (SMA) who have discontinued treatment with
nusinersen (Spinraza®) or risdiplam (Evrysdi®)