Non-interventional, multi-center, long-term follow-up (LTFU) study of subjects dosed with ST-920 in the clinical study ST-920-201. All subjects dosed in the study who completed at least 52 weeks post-infusion follow-up in their primary protocol will be offered to participate. Subjects who enroll will be monitored for a total of up to 5 years following ST-920 infusion.
