CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 4,2011, Pages 227-231, doi:10.3760/cma.j.issn.1007-9408.2011.04.008
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 4,2011, Pages 204-209, doi:10.3760/cma.j.issn.1007-9408.2011.04.004
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 4,2011, Pages 232-234, doi:10.3760/cma.j.issn.1007-9408.2011.04.009
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 4,2011, Pages 200-203, doi:10.3760/cma.j.issn.1007-9408.2011.04.003
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 14, Issue 4,2011, Pages 221-226, doi:10.3760/cma.j.issn.1007-9408.2011.04.007