2013d-789 610 abnormalities amnioticfluid amnioticliquid cell-andtissue-basedtherapy cytology diseases family fetaldiseases fetus first generalpractice gynecology infant maladies malformations maternal-fetalexchange medical mesenchymalstemcells methods newborn newborninfants obstetrics pediatricpathology physiology physiopathology placentaaccreta placentadiseases placentalextracts placentation pregnancytrimester prenatalnutritionalphysiologicalphenomena qp281 qu325 research stemcells stemcelltransplantation therapeuticuse umbilicalcord wq175 wq210p44121981 wq212 wq212m8711982