CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 2,2003, Pages 71-74, doi:10.3760/cma.j.issn.1007-9408.2003.02.002
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 2,2003, Pages 82-84, doi:10.3760/cma.j.issn.1007-9408.2003.02.005
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 2,2003, Pages 85-87, doi:10.3760/cma.j.issn.1007-9408.2003.02.006
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 2,2003, Pages 75-77, doi:10.3760/cma.j.issn.1007-9408.2003.02.003
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 6, Issue 2,2003, Pages 92, doi:10.3760/cma.j.issn.1007-9408.2003.02.019