CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 7, Issue 4,2004, Pages 243-244, doi:10.3760/cma.j.issn.1007-9408.2004.04.017
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CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 7, Issue 4,2004, Pages 252-253, doi:10.3760/cma.j.issn.1007-9408.2004.04.021
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 7, Issue 4,2004, Pages 217-219, doi:10.3760/cma.j.issn.1007-9408.2004.04.008
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 7, Issue 4,2004, Pages 230-232, doi:10.3760/cma.j.issn.1007-9408.2004.04.012