Please assess the completion status of the following clinical trial:

Trial Title: The Impact of Udenafil on Exercise Capacity in Severe Chronic Obstructive Pulmonary Disease (COPD) Patients

Study Design Characteristics:
- Allocation: None
- 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:~* Severe COPD who showed post-bronchodilator forced expiratory volume in 1 second (FEV1) less than 50% of predicted value~Exclusion Criteria:~* Acute exacerbation within 4 weeks of the study entry~* Coronary heart disease~* History of adverse event on PDE-5 inhibitors

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- Udenafil (Type: EXPERIMENTAL): Udenafil 50mg qd po

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