Chinese Journal of Perinatal Medicine, Volume 15, Issue 01,2012, Pages 5-9, Dol:10.3760/cma.j.issn.1007-9408.2012.01.003
Chinese Journal of Perinatal Medicine, Volume 15, Issue 01,2012, Pages 10-15, Dol:10.3760/cma.j.issn.1007-9408.2012.01.004
Chinese Journal of Perinatal Medicine, Volume 15, Issue 01,2012, Pages 16-19, Dol:10.3760/cma.j.issn.1007-9408.2012.01.005
Chinese Journal of Perinatal Medicine, Volume 15, Issue 01,2012, Pages 20-24, Dol:10.3760/cma.j.issn.1007-9408.2012.01.006
Chinese Journal of Perinatal Medicine, Volume 15, Issue 01,2012, Pages 25-29, Dol:10.3760/cma.j.issn.1007-9408.2012.01.007