Please assess the completion status of the following clinical trial:

Trial Title: Clinical Effectiveness of Osteopathic Manipulative Treatment in Chronic Migraine

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

Eligibility Criteria:
Inclusion Criteria:~* aged between 18 and 60 years old~* chronic migraine~Exclusion Criteria:~* secondary forms of headache,~* chronic illness,~* psychiatric illness,~* post-menopausal women

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- sham therapy (Type: SHAM_COMPARATOR): subtracting serial sevel (McPartland 2003)
- usual care (Type: OTHER): triptans treatment only
- OMT (Type: EXPERIMENTAL): 8 sessions of osteopathic manipulative treatment

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