Please assess the completion status of the following clinical trial:

Trial Title: Identification of Patients at Risk of Chronic Back Pain Using Questionnaires

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

Eligibility Criteria:
Inclusion Criteria:~* acute (\<6 weeks) back pain~* \>20 und \<60 years of age~* good oral and written knowledge of German language~Exclusion Criteria:~* any treatment for back pain within the last 6 months~* Cauda equina~* tumor~* generalized pain~* severe systemic illness~* substance abuse~* pregnancy

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- acute back pain (Type: None): None

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