Search strategy
Two authors independently searched the PubMed, Cochrane Library, EMBASE, Web of Science,CNKI, Wanfang and VIP databases from inception to April 1, 2022. We used the following search terms: ((Infant OR newborn OR neonat* OR premature OR very low birth weight OR low birth weight OR VLBW OR LBW) AND (Noninvasive High-Frequency Oscillatory Ventilation OR Noninvasive High Frequency Oscillation Ventilation OR Non-invasive high-frequency oscillatory ventilation OR NHFOV OR nHFV) AND (nasal intermittent positive pressure ventilation OR NIPPV OR nasal intermittent mandatory ventilation OR NIMV OR non-invasive positive pressure ventilation OR synchronized intermittent mandatory ventilation OR nasopharyngeal synchronized intermittent mandatory ventilation )). No language restrictions were applied. A third author was consulted for authors’ differences in opinion during the study selection process.