CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 4,2009, Pages 277-280, doi:10.3760/cma.j.issn.1007-9408.2009.04.012
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 4,2009, Pages 241-244, doi:10.3760/cma.j.issn.1007-9408.2009.04.001
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 4,2009, Pages 297-299, doi:10.3760/cma.j.issn.1007-9408.2009.04.017
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 4,2009, Pages 253-256, doi:10.3760/cma.j.issn.1007-9408.2009.04.004
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 4,2009, Pages 319-320, doi:10.3760/cma.j.issn.1007-9408.2009.04.027