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Subjects
- Pneumonia, Bacterial -- prevention & control1
- Pneumonia, Ventilator-Associated -- epidemiology1
- Pneumonia, Ventilator-Associated -- etiology1
- Pneumonia, Ventilator-Associated -- microbiology1
- Pneumonia, Ventilator-Associated -- mortality1
- Pneumonia, Ventilator-Associated -- prevention & control1
- Respiration, Artificial -- adverse effects1
- Risk Factors1
- Tracheostomy1
- United States1
- Ventilators, Mechanical -- adverse effects1