Please assess the completion status of the following clinical trial:

Trial Title: Opioid Rotation From Morphine to Methadone in Treatment of Non-malignant Pain

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* 18-70 years of age~* non-malignant chronic pain~* morphine use~Exclusion Criteria:~* addiction~* kidney disorders

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- switch from morphine to methadon (Type: EXPERIMENTAL): None

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