Please assess the completion status of the following clinical trial:

Trial Title: NGLY1 Deficiency: A Prospective Natural History Study

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: COHORT
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Parent(s)/legal representative and/or participant must be willing and able to give informed consent/assent for participation in the study~* Males or females of any age~* Suspected or confirmed diagnosis of NGLY1 deficiency with genetic variants in both NGLY1 alleles and consistent clinical characteristics~* Participant and caregiver must be willing to provide clinical data, participate in standardized assessments, and provide biological samples (if living in the United States)~* Willingness to travel to Palo Alto, CA is favored, but not required~Exclusion Criteria:~* The presence of a second, confirmed disorder, genetic or otherwise, affecting neurodevelopment or with other overlapping symptoms of NGLY1 deficiency

- Gender: ALL
- Minimum Age: None
- Maximum Age: None
- Healthy Volunteers: f

Based on this trial design, predict the completion outcome and termination type (if applicable).