CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 3,2007, Pages 148-151, doi:10.3760/j.issn:0529-567x.2007.03.002
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 3,2007, Pages 173-175, doi:10.3760/j.issn:0529-567x.2007.03.008
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 3,2007, Pages 196-200, doi:10.3760/j.issn:0529-567x.2007.03.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 3,2007, Pages 187-191, doi:10.3760/j.issn:0529-567x.2007.03.012
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 3,2007, Pages 161-164, doi:10.3760/j.issn:0529-567x.2007.03.005