Please assess the completion status of the following clinical trial:

Trial Title: Combination Therapy of Bosentan and Aerosolized Iloprost in Idiopathic Pulmonary Arterial Hypertension (IPAH)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* IPAH~* \> 3 months treatment with bosentan~* 6 minute walk distance 150 - 425 m~Exclusion Criteria:~* other forms of pulmonary hypertension~* severe comorbidities~* cotreatment with sildenafil or investigational drugs

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Aerosolized Iloprost (Type: ACTIVE_COMPARATOR): None
- Bosentan monotherapy (Type: PLACEBO_COMPARATOR): None

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