CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 2,2009, Pages 136-139, doi:10.3760/cma.j.issn.1007-9408.2009.02.016
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 2,2009, Pages 153-156, doi:10.3760/cma.j.issn.1007-9408.2009.02.022
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 2,2009, Pages 146-148, doi:10.3760/cma.j.issn.1007-9408.2009.02.019
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 12, Issue 2,2009, Pages 140-144, doi:10.3760/cma.j.issn.1007-9408.2009.02.017