CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 515-517, doi:10.3760/j.issn:0529-567x.2007.08.003
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 542-545, doi:10.3760/j.issn:0529-567x.2007.08.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 559-560, doi:10.3760/j.issn:0529-567x.2007.08.015
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 576, doi:10.3760/j.issn:0529-567x.2007.08.022
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 8,2007, Pages 518-522, doi:10.3760/j.issn:0529-567x.2007.08.004