Kalani 2016.

Methods	Single‐centre 3‐arm study
Participants	Inclusion criteria Birthweight < 1500g, GA < 32 weeks 6 to 12 hours old
Interventions	Active intervention 1 (n = 31) Oral ibuprofen 10, 5, 5 mg/kg every 24 hours Active intervention 2 (n = 31) Oral indomethacin 0.2 mL/kg daily for 3 days Control (n = 31) Standard of care
Outcomes	Relevant outcomes include Mortality IVH PDA NEC GI bleeding
Notes	Primary study location: Akbar‐Abadi Hospital (affiliated with Iran University of Medical Sciences, Theran, Iran) Study period: 2013 to 2014 The methods section suggests that it is a retrospective study, and we were unable to establish contact with the primary author to clarify this discrepancy