Donze A, Smith JR, Bryowsky K. Safety and efficacy of ibuprofen versus indomethacin for the treatment of patent ductus arteriosus in the preterm infant: reviewing the evidence. Neonatal Netw. 2007 May;26(3):187–95. doi: 10.1891/0730-0832.26.3.187. PMID: 17521065.