CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 8,2006, Pages 572-573, doi:10.3760/j.issn:0529-567X.2006.08.022
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 8,2006, Pages 554-558, doi:10.3760/j.issn:0529-567X.2006.08.014
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 8,2006, Pages 533-536, doi:10.3760/j.issn:0529-567X.2006.08.009
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 8,2006, Pages 574-576, doi:10.3760/j.issn:0529-567X.2006.08.023
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 41, Issue 8,2006, Pages 564-566, doi:10.3760/j.issn:0529-567X.2006.08.018