Please assess the completion status of the following clinical trial:

Trial Title: Treatment of Thromboangiitis Obliterans (Buerguer's Disease) With Bosentan

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:~* Critical ischemia in any extremity, causing pain at rest or non-healing ischemic ulcers, present for at least four weeks with no evidence of improvement in response to conventional treatment.~Exclusion Criteria:~* Being candidates for surgical or endovascular revascularisation of the extremity studied.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Bosentan (Type: None): Bosentan

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