CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 6,2007, Pages 423-425, doi:10.3760/j.issn:0529-567x.2007.06.018
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 6,2007, Pages 403-407, doi:10.3760/j.issn:0529-567x.2007.06.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 6,2007, Pages 390-393, doi:10.3760/j.issn:0529-567x.2007.06.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 6,2007, Pages 419-420, doi:10.3760/j.issn:0529-567x.2007.06.016