Please assess the completion status of the following clinical trial:

Trial Title: Leukotriene D4 Nasal Provocation Test in Allergic Rhinitis

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: DIAGNOSTIC
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Patients with allergic rhinitis accompanied with or without asthma~* positive skin prick test (SPT)~* had no acute upper or lower airway infection 2 weeks prior to study~* no oral or nasal anti-histamines~* no leukotriene receptor antagonists for 1 week~* no oral or nasal and inhaled corticosteroids for 2 weeks~Exclusion Criteria:~* smokers~* a past confirmed history of chronic respiratory disease other than asthma~* other severe systemic diseases (myocardial infarction, malignant tumor, etc.)~* under immunotherapy~* unable to complete the test or had limited understanding~* pregnancy

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 50 Years
- Healthy Volunteers: t

Study Arms:
- leukotriene D4 (Type: EXPERIMENTAL): Nasal provocation test was induced by leukotriene D4 with a stepwisely concentration method (4 mcg/ml, 8 mcg/ml, 16 mcg/ml).
- histamine (Type: EXPERIMENTAL): Nasal provocation test was induced by histamine with a stepwisely concentration method (0.4 mg/ml, 0.8 mg/ml, 1.6 mg/ml, 3.2mg/ml).

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