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Nonlinear regression (Hill function) of alfentanil clearance and bodyweight in children including preterm and term neonates (R2=0.70, solid grey line). Allometric function of alfentanil clearance and bodyweight in children including preterm and term neonates (R2=0.65, dotted black line). Abbreviations: Bmax maximum clearance, K50 bodyweight at which half-maximum clearance is reached, h Hill coefficient.
