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In-hospital pattern of breast-feeding (BF) by study cohort (
, cohort 1, n 1320; 
, cohort 2, n 1240). The two cohorts of breast-feeding mother–infant pairs were recruited from in-patient postnatal units of four public hospitals in Hong Kong, before (cohort 1) and after (cohort 2) implementation of the policy to stop accepting free infant formula; all P<0·001
