CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 10, Issue 3,2007, Pages 151-154, doi:10.3760/cma.j.issn.1007-9408.2007.03.002
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 10, Issue 3,2007, Pages 162-165,插图3-2, doi:10.3760/cma.j.issn.1007-9408.2007.03.005
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 10, Issue 3,2007, Pages 166-169, doi:10.3760/cma.j.issn.1007-9408.2007.03.006
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 10, Issue 3,2007, Pages 183-185,插图3-3, doi:10.3760/cma.j.issn.1007-9408.2007.03.010