Please assess the completion status of the following clinical trial:

Trial Title: Heliox in Experimental Upper Airway Obstruction

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE1/PHASE2
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Volunteers of both sexes were recruited via posting in student forum of University of Witten/Herdecke~* Willingness to spend about 2h in the clinical exp. lab.~Exclusion Criteria:~* Acute airway infection~* History of asthma~* Smokers~* Pregnancy~* Abnormal lab. screen with liver function tests, Creat./BUN, CBC, blood glucose~* Anxiety or mood disorder~* Any chronic disease (incl. lung \& heart disease, cancer, endocrine disorder)~* Mental retardation

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 60 Years
- Healthy Volunteers: t

Study Arms:
- 1 (Type: ACTIVE_COMPARATOR): Study subjects where breathing Heliox with a fraction of Helium of 25% followed by 50% and 75% with larger external resistor in comparison to medical air
- 2 (Type: ACTIVE_COMPARATOR): Study subjects where breathing Heliox with a fraction of Helium of 50% followed by 75% and 25% with larger external resistor in comparison to medical air
- 3 (Type: ACTIVE_COMPARATOR): Study subjects where breathing Heliox with a fraction of Helium of 25% followed by 50% and 75% with larger external resistor in comparison to medical air

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