Please assess the completion status of the following clinical trial:

Trial Title: Cost- Effectiveness and Quality of Life Assessment in Major Depression Disorder

Study Design Characteristics:
- Allocation: None
- Intervention Model: SEQUENTIAL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~1. ages between 18 and 65;~2. current acute unipolar depression episode;~3. total capacity to understand and respond to self-applied instruments;~4. the presence of symptoms in the last 30 days;~5. abstinence for at least 30 days for drug addicts~Exclusion Criteria:~1. presence of Organic Brain Syndrome (OBS);~2. pregnancy or lactation;~3. criteria for psychiatric hospitalization.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Sertraline (Type: EXPERIMENTAL): Group Started: sertraline (50mg-200mg)~Subjects evaluated for responsiveness every 2 weeks. Responsive to treatment patients remain in the same step. Max. step duration of 8 weeks.~First step: Monotherapy with sertraline (50-200mg). Non responsive patients: 2nd step.~Second step: Sertraline 200mg + lithium (900mg-1500mg)~Non responsive patients: 3rd step.~Third step: Nortriptyline 100mg~Non responsive patients: 4th step.~Fourth step: Nortriptyline 100mg + lithium (900mg-1500mg)~Non responsive patients : 5th step~Fifth step : Nortriptyline 100mg + sertraline 200mg Non responsive patients~sixth step: Nortriptyline 100mg + sertraline 200mg + Lithium ( 900mg- 1500mg)

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