JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 3,2002, Pages 161-162, doi:10.3969/j.issn.1003-6946.2002.03.017
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 3,2002, Pages 164-167, doi:10.3969/j.issn.1003-6946.2002.03.019
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 3,2002, Pages 132-133, doi:10.3969/j.issn.1003-6946.2002.03.003
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 3,2002, Pages 177-178, doi:10.3969/j.issn.1003-6946.2002.03.025
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 3,2002, Pages 163-163, doi:10.3969/j.issn.1003-6946.2002.03.018