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[24], '48': [25, 59, 177], 'hours': [26, 60, 95, 178], 'administration': [28], 'neonates.': [30], 'Free': [31, 80], 'and': [32, 81, 93, 107, 117, 131, 147], 'total': [33, 82, 122, 156, 208], 'levels': [35, 187], 'considered': [37], 'as': [38], 'predictors': [39], 'toxicity.The': [41], 'aim': [42], 'the': [44, 51, 97, 190], 'LEVON': [45], 'pilot': [46], 'study': [47], 'was': [48], 'detect': [50], 'analgesia': [57, 171], 'exceeding': [58], 'neonates.Ten': [62], 'neonates': [63], 'received': [64], 'a': [65, 74], 'loading': [66], 'dose': [67], '(1.25': [70], 'mg/kg)': [71], 'followed': [72], 'by': [73], 'continuous': [75, 212], 'infusion': [76], '(0.2': [77], 'mg/kg/hour)': [78], 'epidurally.': [79], 'concentrations': [84, 120, 136, 154], 'were': [85, 112, 124, 140, 168], 'measured': [86], '0.5,': [87], '1,': [88, 196, 198], '6,': [89], '12,': [90], '36,': [91], '72': [92], '144': [94], 'after': [96], 'start': [98], 'infusion.': [100], 'Cumulative': [101], 'doses': [102], 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'www.elis.sk': [204], 'Keywords:': [205], 'neonate,': [210], 'caudal': [211], 'analgesia,': [214], 'postoperative': [215], 'pain.': [216]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W4313487906', 'counts_by_year': [{'year': 2024, 'cited_by_count': 1}], 'updated_date': '2024-09-14T17:40:44.308509', 'created_date': '2023-01-06'}