Please assess the completion status of the following clinical trial:

Trial Title: Target-Controlled Infusion of Propofol for Flexible Bronchoscopy Sedation

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Adult patients (18 years old or more) required elective flexible bronchoscopy and sedation.~Exclusion Criteria:~* American Society of Anesthesiologists classification of physical status 4 and 5, including hepatic or renal failure, severe obstructive sleep apnea and severe chronic obstructive pulmonary disease.~* Mallampati score 4 or 5.~* Significant Central nervous system disorders or other factors contributing to access consciousness difficultly.~* Men with body mass index(BMI) large than 42，Females with BMI large than 35.~* Allergic history to study drugs.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 95 Years
- Healthy Volunteers: f

Study Arms:
- Titration by target effect site concentration (Cet) 0.5μg/ml (Type: ACTIVE_COMPARATOR): The investigator will titrate the Cet to keep stable vital signs and sedative level during the flexible bronchoscopy. The criteria for titration is descried in the intervention.
- Titration by Cet 0.2μg/ml (Type: ACTIVE_COMPARATOR): The investigator will titrate the Cet to keep stable vital signs and sedative level during the flexible bronchoscopy. The criteria for titration is descried in the intervention.
- Titration by Cet 0.1μg/ml (Type: ACTIVE_COMPARATOR): The investigator will titrate the Cet to keep stable vital signs and sedative level during the flexible bronchoscopy. The criteria for titration is descried in the intervention.

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