A Phase 1, Open-label, Ascending Dose Study to Evaluate the Safety, Tolerability, Efficacy, Pharmacokinetics and Pharmacodynamics of Recombinant Human Heparan N-Sulfatase (rhHNS, GC1130A) Via Intracerebroventricular Access Device in Patients With Sanfilippo Syndrome Type A (MPS IIIA) | Arctuva