Figure 1.

PRISMA flowchart. *Retrieval strategy I: “nippv” or “bipap” or “cpap” or “niv” or “nipsv” or “noninvasive positive pressure ventilation” or “non invasive positive pressure ventilation” or “noninvasive ventilation” or “non invasive ventilation” or “bilevel positive airway pressure” or “continuous positive airway pressure” or “noninvasive pressure support ventilation” or “non invasive pressure support ventilation” or “mask ventilation” or “nasal ventilation”) and (airway extubation or ventilator weaning); **Retrieval strategy II: “high flow nasal cannula” or “high flow nasal therapy” or “high flow nasal oxygen” or “high flow oxygen therapy” or “high flow therapy” or “optiflow (respiration)” or “nasal highflow”) and (airway extubation or ventilator weaning).