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Selection of sample for analysis of in utero exposure to maternal tobacco smokea and the daughter's risk of fetal loss later in life in the MoBa cohort. Abbreviations: BMI, body mass index; MBR, Medical Birth Registry; Q1, questionnaire-1. aAsked in the first MoBa questionnaire as: Did your mother smoke when she was pregnant with you? bBased on data set version 4.301.
