CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 737-741, doi:10.3760/j.issn:0529-567x.2007.11.006
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 774-775, doi:10.3760/j.issn:0529-567x.2007.11.016
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 753-755, doi:10.3760/j.issn:0529-567x.2007.11.010
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 42, Issue 11,2007, Pages 771-773, doi:10.3760/j.issn:0529-567x.2007.11.015