CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 5,2011, Pages 316-318, doi:10.3760/cma.j.issn.1007-9408.2011.05.013
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 5,2011, Pages 319-320, doi:10.3760/cma.j.issn.1007-9408.2011.05.014
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 5,2011, Pages 267-272, doi:10.3760/cma.j.issn.1007-9408.2011.05.003
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 5,2011, Pages 261-266, doi:10.3760/cma.j.issn.1007-9408.2011.05.002
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 5,2011, Pages 306-310, doi:10.3760/cma.j.issn.1007-9408.2011.05.011