CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 4,2003, Pages 252-254, doi:10.3760/cma.j.issn.1007-9408.2003.04.022
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 4,2003, Pages 206-210, doi:10.3760/cma.j.issn.1007-9408.2003.04.004
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 4,2003, Pages 246-248, doi:10.3760/cma.j.issn.1007-9408.2003.04.020
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 4,2003, Pages 218-220, doi:10.3760/cma.j.issn.1007-9408.2003.04.007
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 4,2003, Pages 202-205, doi:10.3760/cma.j.issn.1007-9408.2003.04.003