Please assess the completion status of the following clinical trial:

Trial Title: Change of Airway Hyperresponsiveness to Mannitol and Methacholine in Patients With Asthma

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* clinically well-controlled asthma~Exclusion Criteria:~* Smokers~* women planning a pregnancy or pregnant~* patients with any significant illness

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

Study Arms:
- montelukast (Type: EXPERIMENTAL): A leukotriene receptor antagonist (LTRA, montelukast) is added to a basic treatment of inhaled corticosteroids (ICS) + long-acting betamimetics (LABA) in well-controlled patients with asthma.

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