CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 6,2011, Pages 321-324, doi:10.3760/cma.j.issn.1007-9408.2011.06.001
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 6,2011, Pages 379-380, doi:10.3760/cma.j.issn.1007-9408.2011.06.017
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 6,2011, Pages 328-332, doi:10.3760/cma.j.issn.1007-9408.2011.06.003
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 6,2011, Pages 358, doi:10.3760/cma.j.issn.1007-9408.2011.06.010