Please assess the completion status of the following clinical trial:

Trial Title: Esophagoscopy in Evaluating Treatment in Patients With Stage I-IV Head and Neck Cancer Who Are Undergoing Radiation Therapy and/or Chemotherapy

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: DIAGNOSTIC
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion~* Written informed consent must be obtained from all participants prior to beginning therapy; participants should have the ability to understand and be willing to sign a written informed consent document~* Primary diagnosis of head and neck carcinoma (oral, hypopharyngeal, laryngeal)~* Stage I-IV, undergoing treatment with radiation therapy +/- chemotherapy~Exclusion~* Medical history of esophageal dysfunction~* Pregnant women are not excluded from participation

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

Study Arms:
- Arm I (Type: EXPERIMENTAL): Patients undergo transnasal esophagoscopy at baseline and 3 months following completion of radiation therapy and/or chemotherapy.

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