Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SASAKI Ryo and YAMAGUCHI Kazuki and IMAIZUMI Toshifumi and HIURA Yukari and IMAFUKU Shinichi,Two Cases of Umbilical Tumor,The Nishinihon Journal of Dermatology,03869784,Western Division of Japanese Dermatological Association,2016,78,6,625-629,https://cir.nii.ac.jp/crid/1390282679279582336,https://doi.org/10.2336/nishinihonhifu.78.625