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Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.
1. ‘moderately preterm’ [ti] OR ‘late preterm’ [ti] OR ‘moderately premature’ [ti] OR ‘late premature’ [ti]
2. ‘extremely low birth weight’ [ti] OR ‘very low birth weight’ [ti] OR ‘ELBW’ [ti] OR ‘VLBW’ [ti] OR ‘extremely premature’ [ti] OR ‘very premature’ [ti] OR ‘extremely preterm’ [ti] OR ‘very preterm’ [ti]
↵ii Calculated using modelled cost estimates from table 5 in Ref. 5, and population data from Table E in Ref. 1. Costs converted from 2006 pounds to 2006 US dollars using Purchasing Power Parity,6 and to 2013 currency using Producer Price Index.7