National Center for Women and Children Health,China CDC,Beijing 100083,China;
National Center for Women and Children Health,China CDC,Beijing 100083,China;
Department of Obstetrics and Gynecology,First Affiliated Hospital,Peking University,Beijing 100034,China;
Department of Obstetrics and Gynecology,First Affiliated Hospital,Peking University,Beijing 100034,China;
spouse abuse; pregnancy; prevalence;