Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Eiichi Natsuyama and Takahide Mori and Norimasa Sagawa and Hiroaki Itoh and Yoshiyuki Ihara,Nuchal-fold thickening in Down syndrome fetuses: transient appearance and spontaneous resolution in the second trimester,jpme,0300-5577,Walter de Gruyter GmbH,1993-01-01,21,,139-145,https://cir.nii.ac.jp/crid/1870302167552806656,https://doi.org/10.1515/jpme.1993.21.2.139