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CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 8, Issue 1,2005, Pages 9-12, doi:10.3760/cma.j.issn.1007-9408.2005.01.003
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 8, Issue 1,2005, Pages 13-16, doi:10.3760/cma.j.issn.1007-9408.2005.01.004