Coffee intake during pregnancy and childhood acute leukemia - A cohort study.

Objectives: To estimate a possible association between coffee intake during pregnancy and risk of childhood acute leukemia by using a cohort design.

Methods: We included data from two birth cohorts; the Danish National Birth Cohort and the Aarhus Birth Cohort. Recruitment of 141,216 eligible pregnancies occurred from 1 August 1989 to 31 December 2012.