Please assess the completion status of the following clinical trial:

Trial Title: Azathioprine Based on Endoscopy After Clinical Remission in Moderate to Severe Ulcerative Colitis

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Ulcerative colitis patients with moderate to severe activity who achieved a clinical remission by the first course of corticosteroids~* Newly diagnosed or without steroid use during last 1 year~* Endoscopic Mayo subscore \>0~Exclusion Criteria:~* Patients with azathioprine or biologics therapy

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- Azathioprine (Type: ACTIVE_COMPARATOR): Azathioprine (1.5mg/kg) po for 1 year
- Sugar pill (Type: PLACEBO_COMPARATOR): Placebo drug identical to azathioprine (1.5mg/kg) po for 1 year

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