Peribiliary cysts: diagnostic features on endoscopic ultrasound and digital cholangioscopy.

Competing Interests: Michiel Bronswijk has received grants from Prion Medical, Taewoong, and Takeda, and has consultancy agreements with Prion Medical and Taewoong. Diederik Persyn, Thomas Billiet, and Ruben Spitaels declare no conflicts of interest. Hannah van Malenstein has consultancy agreements with Boston Scientific. Schalk Van der Merwe holds the Cook and Boston-Scientific chair in interventional endoscopy and holds consultancy agreements with Cook, Pentax, and Olympus.