CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 3,2011, Pages 146-150, doi:10.3760/cma.j.issn.1007-9408.2011.03.006
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 3,2011, Pages 186-189, doi:10.3760/cma.j.issn.1007-9408.2011.03.017
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 3,2011, Pages 137-141, doi:10.3760/cma.j.issn.1007-9408.2011.03.004
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 3,2011, Pages 174-176, doi:10.3760/cma.j.issn.1007-9408.2011.03.013
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 3,2011, Pages 161-165, doi:10.3760/cma.j.issn.1007-9408.2011.03.010