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This study involved 3 cohorts: a cohort of 500 non-pregnant women who had given birth within the previous 2 y (cohort 1); a cohort of pregnant women who were due to give birth before October 31, 2014 (cohort 2); and a cohort of pregnant women who were due to give birth after October 31, 2014 (cohort 3). They were differentially assessed on 4 subjects using a questionnaire.
