Please assess the completion status of the following clinical trial:

Trial Title: Inhalation of Low Concentration of CO2 in Preterm Infants Not Responding to Caffeine for the Treatment of Apnea

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: SINGLE
- Phase: PHASE2/PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* gestational age at birth \< 33 weeks~* on caffeine treatment for apnea of prematurity at a maintenance dose of 5 mg/kg/day~* having apnea of prematurity (at least 5 self-resolved apneas or 2 apneas requiring intervention/12 hours)~Exclusion Criteria:~* on mechanical ventilation~* presence of congenital anomalies, sepsis or other known causes of apnea~* failure to obtain parental consent

- Gender: ALL
- Minimum Age: 3 Days
- Maximum Age: 60 Days
- Healthy Volunteers: f

Study Arms:
- Inhalation of low concentration of CO2 (Type: EXPERIMENTAL): None
- caffeine only (Type: ACTIVE_COMPARATOR): None

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