Please assess the completion status of the following clinical trial:

Trial Title: Venous Vascularization and Inflammation on Contrast-enhanced Ultrasound (CEUS) in Patients With Thrombosis

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

Eligibility Criteria:
Inclusion Criteria:~* Age greater than 18 years~* acute, idiopathic or provoked, unilateral proximal DVT (involving the popliteal vein or further proximal veins)~* SVT (more than 5cm in length on compression ultrasonography) of the lower- extremity~* Age and sex matched controls will be recruited from volunteers after exclusion of DVT or SVT, and without history of thrombosis and pulmonary embolism~Exclusion Criteria:~* History of previous DVT or SVT of the lower-extremity~* History of pulmonary embolism~* Bilateral DVT or SVT~* DVT associated with intravenous drug abuse, surgery of the lower-extremity in the previous 10 days, or sclerotherapy in the previous 30 days~* Follow-up is not considered feasible~* Heart failure (HYHA III or IV)~* Acute coronary syndrome (\<7d)~* Severe pulmonal-arterial hypertension (pulmonal arterial pressure \>90mmHg)~* Pregnancy

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- Thrombosis (Type: None): Patients with acute, idiopathic or provoked, unilateral proximal DVT (involving the popliteal vein or further proximal veins) and SVT of the lower-extremity detected with duplex ultrasound.~Age and sex matched controls (volunteers)

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