Please assess the completion status of the following clinical trial:

Trial Title: House Dust Mite SLIT in Elderly Patients

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

Eligibility Criteria:
Inclusion Criteria:~* Subjects with allergic rhinitis who fulfilled the ARIA criterion and had a positive skin prick test (SPT), were positive for specific immunoglobulin E (sIgE) and had positive nasal provocation tests (NPTs) by Dermatophagoides pteronyssinus (Der p) and Dermatophagoides farinae (Der f) were included in the study~Exclusion Criteria:~* Patients with any of the following characteristics were excluded:~  * hypersensitivity to other allergens,~ * non-allergic rhinitis (especially senile or vasomotor rhinitis) or~ * severe non-stable diseases (especially bronchial asthma). However, stable coronary disease, diabetes, arterial hypertension and well-controlled, mild or atopic bronchial asthma were permitted.

- Gender: ALL
- Minimum Age: 60 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- non immunotherapy treatment (Type: NO_INTERVENTION): None
- sublingual immunotherapy course (Type: ACTIVE_COMPARATOR): None

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