Endoscopic Ultrasound-Guided Fine-Needle Aspiration in Focal Pancreatic Lesions: A Prospective Intraindividual Comparison of Two Needle Assemblies - Fritscher-Ravens, A.; Topalidis, T.; Bobrowski, C.; Krause, C.; Thonke, F.; Jäckle, S.; Soehendra, N. (Endoscopy, 2001)