Please assess the completion status of the following clinical trial:

Trial Title: Impact of Vitamin D on Endothelial Function and Blood Biomarkers Including CD28 Null Cells in CKD

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* CKD 3-4 Age 18-80~Exclusion Criteria:~* Recent MI, CVA, malignancy active infection active inflammation High calcium already on Viatmin D therapy

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

Study Arms:
- Vitamin D (Type: EXPERIMENTAL): Cholecalciferol 300,000 twice

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