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'observational': [48], 'cohort': [49], 'study,': [50], 'aged': [52], '1–18': [53], 'years,': [54], 'requiring': [55], 'ventilation': [57, 164, 195, 206, 248, 257], 'were': [58, 76, 103, 137], 'included.': [59], 'Ultrasound': [60], 'at': [65], 'end‐expiration': [66], '(DTe)': [67], 'end‐inspiration': [69], '(DTi),': [70], 'thickening': [73], 'fraction': [74], '(DTF)': [75], 'performed': [77], 'daily': [78], 'during': [79, 242], 'admission,': [84], 'pre‐': [86], 'post‐extubation.': [88], 'Diaphragmatic': [89, 187], '(%)': [91], 'rate': [94, 175, 189], '(rate': [95], 'decline': [97], 'DTe,': [99, 133], '%': [100], 'per': [101, 184], 'day)': [102], 'calculated.': [104], 'Measurements': [105], 'Main': [107], 'Results': [108], 'Of': [109, 118], '55': [110], '(74.6%': [112], 'boys)': [113], 'enrolled,': [114], '20': [115], '(36.4%)': [116], 'died.': [117], '35': [119], 'with': [121], 'planned': [122], 'extubation,': [123], '5': [124], '(14.3%)': [125], 'required': [126], 'reintubation.': 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