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Overview
Supplementary change following on from previous patch where preterm requests for absent data have meaningful error messages returned.
In CDC age correction does not occur for any babies that are born gestation 37-42 weeks, or any preterm babies >2y of age.
A conditional has been added to check for gestation in the Measurement class where reference requested is CDC. In these circumstances, chronological and corrected ages are reset to be equal, and the discrepancy between this and supplied gestation is used in the
age_advice_strings
function to give the correct feed back to users on when age correction has happened