CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 1,2002, Pages 5-7, doi:10.3760/j.issn:0529-567X.2002.01.003
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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 1,2002, Pages 1-2, doi:10.3760/j.issn:0529-567X.2002.01.001
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 37, Issue 1,2002, Pages 33-35, doi:10.3760/j.issn:0529-567X.2002.01.012