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Advisory Boards: Medela and Astarte Medical [Preterm infant nutrition]; Nestle Nutrition Institute Global Scientific Advisory Board [Preterm infant nutrition] (have rotated off in the past year). Speaker\u2019s Bureau: Mead Johnson [Nutrition in low birthweight infants]. Other Financial Interest: Winston & Strawn LLP, and Abbot [Expert witness]. The remaining authors declare no conflicts of interest.","order":1,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Ethics"}},{"value":"Written informed consent was obtained from the parents or legal guardians of all the infants at the time of enrollment in the Korean Neonatal Network. No additional informed consent was required for this study.","order":2,"name":"Ethics","label":"Informed consent","group":{"name":"EthicsHeading","label":"Ethics"}}]}}