Endosonography-assisted transmural endoscopic drainage of pancreatic pseudocysts: A single center experience - Şişman, Gürhan; HATEMİ, Gülen; Erzin, Yusuf; COŞKUN, Muharrem; Tuncer, Murat; ŞENTÜRK, Hakan (Turkish Journal of Gastroenterology, 2012)