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Sample selection for eligible privately-insured women aged 15–44 years with and without congenital heart defects (CHD), and CHD severity
*Women who were aged 15–44 years in 2014, had prescription drug coverage included in the database in 2014, and were enrolled for ≥11 months per year annually during 2011–2014. †Pregnancy was defined using end of pregnancy billing codes using an algorithm published previously.9
