Please assess the completion status of the following clinical trial:

Trial Title: An Observational Study of BOTOX® as Headache Prophylaxis for Chronic Migraine

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_ONLY
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~- Prescribed BOTOX® for the prophylaxis of headaches.~Exclusion Criteria:~* Received treatment with any botulinum toxin Type A serotype in the last 26 weeks~* Current participation in Allergan's Botox Chronic Migraine Post-Authorisation Safety Study (protocol 191622-110).

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

Study Arms:
- BOTOX® (Type: None): BOTOX® (botulinum toxin Type A) administered according to physician prescription for the treatment of chronic migraine; all treatment decisions lie with the physician.

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