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Efficacy of tramadol versus fentanyl for postoperative analgesia in neonates.
Alencar AJ, Sanudo A, Sampaio VM, Góis RP, Benevides FA, Guinsburg R. Alencar AJ, et al. Among authors: sampaio vm. Arch Dis Child Fetal Neonatal Ed. 2012 Jan;97(1):F24-9. doi: 10.1136/adc.2010.203851. Epub 2011 Apr 5. Arch Dis Child Fetal Neonatal Ed. 2012. PMID: 21471025 Clinical Trial.