CHINA JOURNAL OF PERINATAL MEDICINE, Volume 4, Issue 4,2001, Pages 212-214, doi:10.3760/cma.j.issn.1007-9408.2001.04.006
CHINA JOURNAL OF PERINATAL MEDICINE, Volume 4, Issue 4,2001, Pages 204, doi:10.3760/cma.j.issn.1007-9408.2001.04.023
CHINA JOURNAL OF PERINATAL MEDICINE, Volume 4, Issue 4,2001, Pages 218-221, doi:10.3760/cma.j.issn.1007-9408.2001.04.008
CHINA JOURNAL OF PERINATAL MEDICINE, Volume 4, Issue 4,2001, Pages 240-241, doi:10.3760/cma.j.issn.1007-9408.2001.04.015
CHINA JOURNAL OF PERINATAL MEDICINE, Volume 4, Issue 4,2001, Pages 202-204, doi:10.3760/cma.j.issn.1007-9408.2001.04.003