Please assess the completion status of the following clinical trial:

Trial Title: Multicenter Trial of Sublingual Immunotherapy With a Solution of Grass Pollen Allergen Extract in Children

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* 4 - \<12 years (at the time of inclusion)~* Positive SPT~* Positive EAST~* Positive CPT~Exclusion Criteria:~* Serious chronic diseases~* Other perennial allergies

- Gender: ALL
- Minimum Age: 4 Years
- Maximum Age: 11 Years
- Healthy Volunteers: f

Study Arms:
- Immunotherapy (Type: EXPERIMENTAL): Grass pollen allergens in a water/glycerol solution
- Placebo (Type: PLACEBO_COMPARATOR): Water/glycerol solution with phosphate buffered saline

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