Please assess the completion status of the following clinical trial:

Trial Title: Efficacy of Vitamin D Supplementation to Prevent the Risk of Acquiring COVID-19 in Healthcare Workers

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: TRIPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Health workers in areas of care for patients with COVI-19~* Adults~* Men and women.~* That they agree to participate in the study by signing the letter of informed consent~Exclusion Criteria:~* Those who know that they have already suffered from COVID-19~* Those who have received a vitamin D supplement in the previous two weeks.~* Difficulty obtaining blood samples

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 70 Years
- Healthy Volunteers: t

Study Arms:
- cholecalciferol (Vitamin D) (Type: EXPERIMENTAL): cholecalciferol 4,000 IU orally daily (1 capsule) for 30 days
- Starch (Type: PLACEBO_COMPARATOR): Starch 500 mg orally daily (1 capsule) for 30 days

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