title: An unusual cause of acute pancreatitis: annular pancreas and papillary opening of the cystic duct.
authors: Department of Gastroenterology, Ankara Education and Research Hospital, Ankara, Turkey.
authors: Adnan
authors: A
authors: Tas
authors: Seyfettin
authors: S
authors: Köklü
authors: Erdem
authors: E
authors: Kocak
authors: Erdem
authors: E
authors: Akbal
authors: Bilal
authors: B
authors: Ergul