Puncture of Solid Pancreatic Tumors Guided by Endoscopic Ultrasonography: A Pilot Study Series Comparing Trucut and 19-Gauge and 22-Gauge Aspiration Needles - Itoi, T; Itokawa, F; Sofuni, A; Nakamura, K; Tsuchida, A; Yamao, K; Kawai, T; Moriyasu, F (Endoscopy, 2005)