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CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 11, Issue 4,2008, Pages 277-279, doi:10.3760/cma.j.issn.1007-9408.2008.04.019
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 11, Issue 4,2008, Pages 254-257, doi:10.3760/cma.j.issn.1007-9408.2008.04.012