5Nagy S,Bush M,Joanne S,et al.Clinical significance of subchorionic and retroplacental hematomas detected in the first trimester of pregnancy[J].Orv Hetil,2003,102(42):94-100. 被引量：1
6Visitine J,Airoldi J,Berghella V.Indomethacin administration at the time of ultrasound-indicated cerclage is there an association with a reduction in spontaneous pre-term birth[J].Am J Obstet G ynecol,2008,198(1):6431-6433. 被引量：1
