CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 9, Issue 5,2006, Pages 350-351, doi:10.3760/cma.j.issn.1007-9408.2006.05.018
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 9, Issue 5,2006, Pages 301-305,插图5-1, doi:10.3760/cma.j.issn.1007-9408.2006.05.005
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 9, Issue 5,2006, Pages 297-300,插图5-1, doi:10.3760/cma.j.issn.1007-9408.2006.05.004
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 9, Issue 5,2006, Pages 291-293, doi:10.3760/cma.j.issn.1007-9408.2006.05.002
CHINESE JOURNAL OF PERINATAL MEDICINE, Volume 9, Issue 5,2006, Pages 344-346,插图5-4, doi:10.3760/cma.j.issn.1007-9408.2006.05.015