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Coceani F, Olley PM. The response of the ductus arteriosus to prostaglandins. <i>Can J Physiol Pharmacol<\/i> 1973; 51: 220\u2013225.","DOI":"10.1139\/y73-031"},{"key":"2","unstructured":"2. Clyman RI, Heymann MA, Mauray F. Role of circulating prostaglandin E2 in regulation of the ductus arteriosus. <i>Adv Prostaglandin Thromboxane Leukot Res<\/i> 1983; 12: 495\u2013498."},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Coceani F, Olley PM, Bodach E. Lamb ductus arteriosus: Effect of prostaglandin synthesis inhibitors on the muscle tone and the response to prostaglandin E2. <i>Prostaglandins<\/i> 1975; 9: 299\u2013308.","DOI":"10.1016\/0090-6980(75)90034-9"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Smith GC, McGrath JC. Prostaglandin E2 and fetal oxygen tension synergistically inhibit response of isolated fetal rabbit ductus arteriosus to norepinephrine. <i>J Cardiovasc Pharmacol<\/i> 1991; 17: 861\u2013866.","DOI":"10.1097\/00005344-199106000-00001"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Smith GC, Coleman RA, McGrath JC. Characterization of dilator prostanoid receptors in the fetal rabbit ductus arteriosus. <i>J Pharmacol Exp Ther<\/i> 1994; 271: 390\u2013396.","DOI":"10.1016\/S0022-3565(25)22805-1"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Yokoyama U, Minamisawa S, Quan H, Ghatak S, Akaike T, Segi-Nishida E, et al. Chronic activation of the prostaglandin receptor EP4 promotes hyaluronan-mediated neointimal formation in the ductus arteriosus. <i>J Clin Invest<\/i> 2006; 116: 3026\u20133034.","DOI":"10.1172\/JCI28639"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Van Overmeire B, Smets K, Lecoutere D, Van de Broek H, Weyler J, Degroote K, et al. 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Changing expression of cyclooxygenases and prostaglandin receptor EP4 during development of the human ductus arteriosus. <i>Pediatr Res<\/i> 2006; 60: 270\u2013275.","DOI":"10.1203\/01.pdr.0000233066.28496.7c"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Segi E, Sugimoto Y, Yamasaki A, Aze Y, Oida H, Nishimura T, et al. Patent ductus arteriosus and neonatal death in prostaglandin receptor EP4-deficient mice. <i>Biochem Biophys Res Commun<\/i> 1998; 246: 7\u201312.","DOI":"10.1006\/bbrc.1998.8461"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Bouayad A, Kajino H, Waleh N, Fouron JC, Andelfinger G, Varma DR, et al. Characterization of PGE2 receptors in fetal and newborn lamb ductus arteriosus. <i>Am J Physiol Heart Circ Physiol<\/i> 2001; 280: H2342\u2013H2349.","DOI":"10.1152\/ajpheart.2001.280.5.H2342"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Momma K, Toyoshima K, Takeuchi D, Imamura S, Nakanishi T. 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Lipopolysaccharide delays closure of the rat ductus arteriosus by induction of inducible nitric oxide synthase but not prostaglandin E2. <i>Circ J<\/i> 2016; 80: 703\u2013711.","DOI":"10.1253\/circj.CJ-15-1053"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Pacifici GM. Clinical pharmacology of ibuprofen and indomethacin in preterm infants with patent ductus arteriosus. <i>Curr Pediatr Rev<\/i> 2014; 10: 216\u2013237.","DOI":"10.2174\/1573396310666140228235815"},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Gulack BC, Laughon MM, Clark RH, Sankar MN, Hornik CP, Smith PB. Comparative effectiveness and safety of indomethacin versus ibuprofen for the treatment of patent ductus arteriosus. <i>Early Hum Dev<\/i> 2015; 91: 725\u2013729.","DOI":"10.1016\/j.earlhumdev.2015.08.003"},{"key":"25","doi-asserted-by":"crossref","unstructured":"25. Van Overmeire B, Allegaert K, Casaer A, Debauche C, Decaluwe W, Jespers A, et al. 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