Chinese Journal of Perinatal Medicine, Volume 15, Issue 07,2012, Pages 404-410, Dol:10.3760/cma.j.issn.1007-9408.2012.07.002
Chinese Journal of Perinatal Medicine, Volume 15, Issue 07,2012, Pages 411-415, Dol:10.3760/cma.j.issn.1007-9408.2012.07.003
Chinese Journal of Perinatal Medicine, Volume 15, Issue 07,2012, Pages 416-419, Dol:10.3760/cma.j.issn.1007-9408.2012.07.004
Chinese Journal of Perinatal Medicine, Volume 15, Issue 07,2012, Pages 420-424, Dol:10.3760/cma.j.issn.1007-9408.2012.07.005
Chinese Journal of Perinatal Medicine, Volume 15, Issue 07,2012, Pages 425-428, Dol:10.3760/cma.j.issn.1007-9408.2012.07.006