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Cumulative SA µg/kg administered during the first week of life shows a monotonous increase over years. Additional data from surviving infants born in 2018–2019 (n = 57) are included to show the progression of morphine and fentanyl use over time. N = 25 infants received additional fentanyl in 2007 to 2017, n = 23 received additional fentanyl in 2018 to 2019. Deceased infants are excluded from figure (n = 29).
