Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) BUNGER PC,Persistent left superior vena cava and associated structural and functional considerations,Angiology,,,1981,32,,601-608,https://cir.nii.ac.jp/crid/1571698601355206912,https://doi.org/10.1177/000331978103200903