JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 4,2006, Pages 198-200, doi:10.3969/j.issn.1003-6946.2006.04.003
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 4,2006, Pages 200-202, doi:10.3969/j.issn.1003-6946.2006.04.004
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 4,2006, Pages 241-243, doi:10.3969/j.issn.1003-6946.2006.04.022
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 4,2006, Pages 236-238, doi:10.3969/j.issn.1003-6946.2006.04.017
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 22, Issue 4,2006, Pages 193-195, doi:10.3969/j.issn.1003-6946.2006.04.001