Coil valve syndrome: a rare complication of percutaneous transhepatic obliteration successfully treated by argon plasma coagulation and double-balloon endoscopy - Nagaike, Koji; Hayashi, Shiro; Nagai, Kengo; Sasakawa, Hirokazu; Yuguchi, Kiyonori; Yoshida, Yuichi; Naito, Masafumi (Endoscopy, 2019)