Ito K, Fujita N, Noda Y, Kobayashi G, Horaguchi J, Takasawa O, Obana T (2007) Preoperative evaluation of ampullary neoplasm with EUS and transpapillary intraductal US: a prospective and histopathologically controlled study. Gastrointest Endosc 66:740–747

Article  PubMed  Google Scholar 

Kaneko M, Katanuma A, Maguchi H, Takahashi K, Osanai M, Yane K, Hashigo S, Harada R, Kato S, Kato R, Nojima M (2014) Prospective, randomized, comparative study of delineation capability of radial scanning and curved linear array endoscopic ultrasound for the pancreaticobiliary region. Endosc Int Open 2:E160-170

Article  PubMed  PubMed Central  Google Scholar 

Castillo C (2010) Endoscopic ultrasound in the papilla and the periampullary region. World J Gastrointest Endosc 2:278–287

Article  PubMed  PubMed Central  Google Scholar 

Wani S, Cote GA, Keswani R, Mullady D, Azar R, Murad F, Edmundowicz S, Komanduri S, McHenry L, Al-Haddad MA, Hall M, Hovis CE, Hollander TG, Early D (2013) Learning curves for EUS by using cumulative sum analysis: implications for American society for gastrointestinal endoscopy recommendations for training. Gastrointest Endosc 77:558–565

Article  PubMed  Google Scholar 

Nakano Y, Tashima T, Jinushi R, Terada R, Mashimo Y, Kawasaki T, Uraoka T, Ryozawa S (2022) Gel immersion endoscopic submucosal dissection: clinical experience with 13 cases of superficial esophageal cancer. Endosc Int Open 10:E1302–E1306

Article  PubMed  PubMed Central  Google Scholar 

Gwet KL (2014) Handbook of inter-rater reliability: the definitive guide to measuring the extent of agreement among raters, advanced analytics. LLC, Dayton

Google Scholar 

Kanno Y, Ito K, Koshita S, Ogawa T, Kusunose H, Masu K, Sakai T, Murabayashi T, Hasegawa S, Kozakai F, Kawakami Y, Fujii Y, Noda Y (2018) Capability of radial- and convex-arrayed echoendoscopes for visualization of the pancreatobiliary junction. Clin Endosc 51:274–278

Article  PubMed  Google Scholar 

Kang SH, Kim KH, Kim TN, Jung MK, Cho CM, Cho KB, Han JM, Kim HG, Kim HS (2017) Therapeutic outcomes of endoscopic papillectomy for ampullary neoplasms: retrospective analysis of a multicenter study. BMC Gastroenterol 17:69

Article  PubMed  PubMed Central  Google Scholar 

Heinzow HS, Kammerer S, Rammes C, Wessling J, Domagk D, Meister T (2014) Comparative analysis of ERCP, IDUS, EUS and CT in predicting malignant bile duct strictures. World J Gastroenterol 20:10495–10503

Article  PubMed  PubMed Central  Google Scholar 

Cicchetti DV, Feinstein AR (1990) High agreement but low kappa: II. Resolving the paradoxes. J Clin Epidemiol 43:551–558

Article  CAS  PubMed  Google Scholar 

Wongpakaran N, Wongpakaran T, Wedding D, Gwet KL (2013) A comparison of Cohen’s Kappa and Gwet’s AC1 when calculating inter-rater reliability coefficients: a study conducted with personality disorder samples. BMC Med Res Methodol 13:61

Article  PubMed  PubMed Central  Google Scholar 

Toyonaga H, Kin T, Iwano K, Nakamura R, Shimizu T, Chikugo K, Ishii T, Nasuno H, Hayashi T, Takahashi K, Yamazaki H, Katanuma A (2023) Efficacy of gel immersion endoscopic ultrasonography for delineating the duodenal papilla and pancreatobiliary ducts: a retrospective study with video. DEN Open 3:e158

Article  PubMed  Google Scholar 

Suto D, Yoshida M, Otake T, Ichiishi E, Sato K, Osawa Y, Ebinuma H, Odaira H, Suzuki Y, Kohgo Y (2022) Localizing spontaneously hemostatic colonic diverticular bleeding using VISCOCLEAR gel: a case report. Ann Med Surg (Lond) 73:103141

PubMed  Google Scholar 

Fleiss JL, Tytun A, Ury HK (1980) A simple approximation for calculating sample sizes for comparing independent proportions. Biometrics 36:343–346

Article  CAS  PubMed  Google Scholar