Please assess the completion status of the following clinical trial:

Trial Title: Methadone in Pediatric Anesthesiology II

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria.~* Age 11-18 years~* Undergoing general anesthesia and idiopathic posterior spinal surgery with anticipated postop inpatient stay of \> 3 days~* Signed, written, informed consent from legal guardians and assent from patient~Exclusion Criteria.~* History of or known liver or kidney disease.~* Females who are pregnant or nursing.~* Children with developmental delay~* Children undergoing surgery for scoliosis of musculoskeletal origin

- Gender: ALL
- Minimum Age: 11 Years
- Maximum Age: 18 Years
- Healthy Volunteers: f

Study Arms:
- methadone HCl 0.3 mg/kg (Type: EXPERIMENTAL): 0.3mg/kg IV methadone HCl
- methadone HCl 0.4 mg/kg (Type: EXPERIMENTAL): 0.4mg/kg IV methadon HCl
- control group (Type: ACTIVE_COMPARATOR): control no methadone, standard of care opioids.

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