PT - JOURNAL ARTICLE AU - Tsuyoshi Suda AU - Ryota Yoshida AU - Naoki Oishi AU - Eiki Matsushita TI - Biliary stones in the smooth hemispherical mass protruding into the duodenal lumen AID - 10.1136/flgastro-2021-101835 DP - 2021 Apr 07 TA - Frontline Gastroenterology PG - flgastro-2021-101835 4099 - http://fg.bmj.com/content/early/2021/04/07/flgastro-2021-101835.short 4100 - http://fg.bmj.com/content/early/2021/04/07/flgastro-2021-101835.full