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