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Participant flow through the trial. 1 from rural locations (n = 52), insufficient milk supply (n = 36), required interpreter (n = 6); congenital abnormality (n = 3); 2 did not want to take part (n = 25), did not want twins to be randomized individually (n = 8), parent not visiting (n = 1), immediately transferred to another centre (n = 1).
