Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Shoda Junichi,Natural History of Gallstones,Tando,0914-0077,Japan Biliary Association,2017,31,2,187-195,https://cir.nii.ac.jp/crid/1390282679326730752,https://doi.org/10.11210/tando.31.187