著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Karin Källén and Fredrik Serenius and Magnus Westgren and Karel Maršál,Impact of obstetric factors on outcome of extremely preterm births in Sweden: prospective population‐based observational study (EXPRESS),Acta Obstetricia et Gynecologica Scandinavica,0001-6349,Wiley,2015-09-07,94,11,1203-1214,https://cir.nii.ac.jp/crid/1363951795714633728,https://doi.org/10.1111/aogs.12726