CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 6,2003, Pages 333-337, doi:10.3760/cma.j.issn.1007-9408.2003.06.004
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 6,2003, Pages 380-382, doi:10.3760/cma.j.issn.1007-9408.2003.06.017
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 6,2003, Pages 384-385, doi:10.3760/cma.j.issn.1007-9408.2003.06.019
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 6,2003, Pages 375-377, doi:10.3760/cma.j.issn.1007-9408.2003.06.015
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 6,2003, Pages 359-362, doi:10.3760/cma.j.issn.1007-9408.2003.06.010