Please assess the completion status of the following clinical trial:

Trial Title: The Effects of Inhalational Anaesthetics in Cognitive Functions in Down Syndrome Patients

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: SUPPORTIVE_CARE
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE2
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* American Society of Anesthesiologists (ASA) classification I, II or III~* Down syndrome patients~* must be able to undergone general anaesthesia~* dental surgery necessity~Exclusion Criteria:~* severe dementia~* severe hearing, vision, speaking problems

- Gender: ALL
- Minimum Age: 16 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Sevoflurane group (Type: ACTIVE_COMPARATOR): inhalation anaesthetic Sevoflurane, 1 M.A.C. during surgery
- Desflurane group (Type: ACTIVE_COMPARATOR): inhalation anaesthetic Desflurane, 1 M.A.C. during surgery

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