Please assess the completion status of the following clinical trial:

Trial Title: Function of Regulatory T Cells Improved by Dexamethasone in Graves' Patients

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE1
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* GD patients will have been trated with methimazole and serum levels of TSH and FT4 should be in the normal range.~Exclusion Criteria:~* Pregnancy~* Allergy to antithyroid drugs (ATD)~* Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) levels more than two times the upper normal range~* Patients with coexistent endocrine or organ-specific autoimmune diseases (such as those with atopic dermatitis or bronchial asthma)~* Patients taking medications that could affect the immune system (such as corticosteroids), noncompliance because of psychiatric or other serious diseases~* Unwillingness to participate in the study.

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- Isotonic Na chloride (Type: EXPERIMENTAL): The treatment strategy is the same with intervention, only the drug (dexamethasone) will be changed to isotonic Na chloride.

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