関連ワード:  causes of abortion in 2nd trimester    causes of miscarriage in 2nd trimester    causes of recurrent abortion in 2nd trimester    causes of miscarriage in second trimester    most common cause of abortion in 2nd trimester    causes of spontaneous abortion in second trimester    common causes of abortion in second trimester    causes of abortion in first and second trimester    most common cause of miscarriage in 2nd trimester    causes of missed miscarriage in second trimester