CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 761-764, doi:10.3760/j.issn:0529-567x.2007.11.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 790-791, doi:10.3760/j.issn:0529-567x.2007.11.022
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 733-736, doi:10.3760/j.issn:0529-567x.2007.11.005
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 753-755, doi:10.3760/j.issn:0529-567x.2007.11.010