Please assess the completion status of the following clinical trial:

Trial Title: SIS Evaluation of the MRI Defined Subthalamic Nucleus*

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

Eligibility Criteria:
Key Inclusion Criteria:~* Idiopathic PD~* Bilateral or unilateral STN-HFS for PD~* 40% improvement response to medications preoperatively~Key Exclusion Criteria:~* Missing required MR/CT imaging data

- Gender: ALL
- Minimum Age: 50 Years
- Maximum Age: None
- Healthy Volunteers: f

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