Correction: ERCP using a conventional upper gastrointestinal endoscope for a patient with a type I duodenal stricture - Maruyama, Hirotsugu; Kakiya-Ishikawa, Yuki; Tanoue, Kojiro; Hayashi, Kappei; Yamamura, Masafumi; Nagami, Yasuaki; Fujiwara, Yasuhiro (Endoscopy, 2020)