Please assess the completion status of the following clinical trial:

Trial Title: The Effect of Aspirin on Patency of Metal Stent in Malignant Distal Bile Duct Obstruction

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

Eligibility Criteria:
Inclusion Criteria:~* Malignant distal bile duct obstruction~* Over 20 years old~* Techinical success of endoscopic retrograde biliary drainage with metalic stent~Exclusion Criteria:~* Patient's denial~* Previous Aspirin use~* Aspirin allergy~* Contraindication for aspirin~* Life expectancy \< 6mo~* Gastroduodenal ulcer~* History of substance abuse~* Participation in a clinical trial within the past 30 days

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Intervention (Type: EXPERIMENTAL): Intervention : aspirin medication Case with aspirin medication for 6 months after stenting
- Control (Type: PLACEBO_COMPARATOR): Control : placebo medication Case with placebo medication for 6 months after stenting

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