Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Tomoko Nakano and Yumiko Ito and Shima Hirako and Kenji Imai and Tomomi Kotani and Fumitaka Kikkawa and Hiroyuki Tsuda,The association between umbilical 25-hydroxyvitamin D (25(OH)D) levels and neonatal respiratory disorders in placenta previa,Placenta,0143-4004,Elsevier BV,2016-10-01,46,,107,https://cir.nii.ac.jp/crid/1871991017660350080,https://doi.org/10.1016/j.placenta.2016.08.019