JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 2,2002, Pages 66-66, doi:10.3969/j.issn.1003-6946.2002.02.032
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 2,2002, Pages 85-87, doi:10.3969/j.issn.1003-6946.2002.02.011
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 2,2002, Pages 95-97, doi:10.3969/j.issn.1003-6946.2002.02.015
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 2,2002, Pages 72-74, doi:10.3969/j.issn.1003-6946.2002.02.004
JOURNAL OF PRACTICAL OBSTETRICS AND GYNECOLOGY, Volume 18, Issue 2,2002, Pages 65-66, doi:10.3969/j.issn.1003-6946.2002.02.001