Please assess the completion status of the following clinical trial:

Trial Title: A Long-term Efficacy, Safety, and Tolerability Study of BOTOX® in Patients With Chronic Migraine

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

Eligibility Criteria:
Inclusion Criteria:~* Diagnosis of chronic migraine (≥15 days per month with headache lasting 4 hours a day or longer)~Exclusion Criteria:~* Diagnosis of myasthenia gravis, Eaton-Lambert Syndrome, or amyotrophic lateral sclerosis~* Headache attributed to another disorder~* Infection or skin disorder at injection sites~* Previous treatment with botulinum toxin of any serotype for any reason~* Anticipated need for botulinum toxin of any type for any reason during the course of the study~* Previous participation in any botulinum toxin clinical trial

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- BOTOX® (Type: EXPERIMENTAL): Participants received 155 U of onabotulinumtoxinA (BOTOX®) approximately every 12 weeks for 108 weeks. OnabotulinumtoxinA was administered as 31 intramuscular injections in 7 head/neck muscle areas.

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