Please assess the completion status of the following clinical trial:

Trial Title: Epidural Magnesium Sulfate for Post-thoracotomy Pain Control

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

Eligibility Criteria:
Inclusion Criteria:~* American Society of Anesthesiologists physical statuses I-III~* Undergoing thoracotomy~Exclusion Criteria:~* Known hypersensitivity to magnesium sulfate~* Renal failure~* Hepatic dysfunction~* Severe obesity~* Psychotic or neurologic diseases~* Currently taking opioid or calcium channel blocker~* AV block degree II or III~* Refused to participate in trial

- Gender: ALL
- Minimum Age: 16 Years
- Maximum Age: 85 Years
- Healthy Volunteers: f

Study Arms:
- Group I (Type: ACTIVE_COMPARATOR): magnesium group (Mg)
- Group II (Type: PLACEBO_COMPARATOR): control group (C)

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