Please assess the completion status of the following clinical trial:

Trial Title: Vaccine Responses to Influenza A H1N1/09 Immunization in High-risk Patients

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* medically recommended influenza A(H1N1) immunization~* signed informed consent~Exclusion Criteria:~* failure or refusal to provide sufficient blood for antibody determination

- Gender: ALL
- Minimum Age: 6 Months
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- High-risk patients ( 5 cohorts) (Type: EXPERIMENTAL): None
- Healthy controls (Type: ACTIVE_COMPARATOR): None

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