Please assess the completion status of the following clinical trial:

Trial Title: Leech Therapy for Postherpetic Neuralgia

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:~* 18 to 85 years of age~* \>6 months thoracal postherpetic neuralgia~* informed consent~Exclusion Criteria:~* if leech therapy is contraindicated~* physical and mental disability to participate in the study examinations

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 85 Years
- Healthy Volunteers: f

Study Arms:
- Leech therapy (Type: None): Patients receiving leech therapy in the outpatient clinic

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