CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 38, Issue 10,2003, Pages 643-646, doi:10.3760/j.issn:0529-567X.2003.10.020
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 38, Issue 10,2003, Pages 633-634, doi:10.3760/j.issn:0529-567X.2003.10.013
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 38, Issue 10,2003, Pages 621-624, doi:10.3760/j.issn:0529-567X.2003.10.009
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