Please assess the completion status of the following clinical trial:

Trial Title: Olanzapine Compared to Lamotrigine in the Prevention of Depressive Episode in the Patients With Bipolar Disorder

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~The patients aged 15 to 50 who have bipolar disorder defined by the DSM-IV in remission state(YMRS\<12, HAMD\<7, CDR\<3) for at least two months and have already received olanzapine or lamotrigine as the maintenance treatment for one month. In addition, they should have at least three hypomanic, manic, depressive or mixed episodes previously.~Exclusion Criteria:~1. The patients are not willing to participate in the study after detailed explanation.~2. The patients who could not followed the investigators' instruction~3. The patients who have severe neurological or mental illness like epileptic disorder, history of stroke, schizophrenia, schizoaffective disorder, mental retardation or uncontrolled suicide risk.~4. The patients who have severe medical illness or surgical conditions like uncontrolled abnormal thyroid function, history of heart attack, uncontrolled hypertension.~5. The patient who are taking other mood stabilizers or antipsychotics within one month prior to the evaluation of entering our study.~6. The patients who are taking medications that might interfere with the metabolism of olanzapine or lamotrigine.~7. The patient who are allergy to olanzapine or lamotrigine.

- Gender: ALL
- Minimum Age: 15 Years
- Maximum Age: 50 Years
- Healthy Volunteers: f

Study Arms:
- lamotrigine (Type: ACTIVE_COMPARATOR): maintenance treatment of the patients with bipolar disorder with olanzapine or lamotrigine
- olanzapine (Type: ACTIVE_COMPARATOR): maintenance treatment of the patients with bipolar disorder with olanzapine or lamotrigine

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