CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 2,2002, Pages 113-117, doi:10.3760/cma.j.issn.1007-9408.2002.02.011
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 2,2002, Pages 118-120, doi:10.3760/cma.j.issn.1007-9408.2002.02.012
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 2,2002, Pages 86-88, doi:10.3760/cma.j.issn.1007-9408.2002.02.003
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 5, Issue 2,2002, Pages 120, doi:10.3760/cma.j.issn.1007-9408.2002.02.028