CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 4,2002, Pages 307-309, doi:10.3760/cma.j.issn.1007-9408.2002.04.024
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CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 4,2002, Pages 288-289, doi:10.3760/cma.j.issn.1007-9408.2002.04.017
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 4,2002, Pages 264-265, doi:10.3760/cma.j.issn.1007-9408.2002.04.008