CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 11, Issue 3,2008, Pages 150-154, doi:10.3760/cma.j.issn.1007-9408.2008.03.009
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 11, Issue 3,2008, Pages 166-168, doi:10.3760/cma.j.issn.1007-9408.2008.03.014
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 11, Issue 3,2008, Pages 191-192, doi:10.3760/cma.j.issn.1007-9408.2008.03.020
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 11, Issue 3,2008, Pages 162-165, doi:10.3760/cma.j.issn.1007-9408.2008.03.013