Text and Data Mining valid from 2019-02-06
Received: 17 May 2018
Accepted: 30 January 2019
First Online: 6 February 2019
Compliance with ethical standards
: Christopher C. Thompson: Boston Scientific (Consultant) and Olympus (Consultant, Research Support). Hiroyuki Aihara: Boston Scientific (Consultant), Olympus (Consultant), and Fujifilm Medical Systems (Consultant). Drs. Ge, Jirapinyo, Ohya, Tamai, and Sumiyama have no conflicts of interest or financial ties to disclose.