Small Neuroendocrine Pancreatic Tumors in Multiple Endocrine Neoplasia Type 1 (MEN1): Least Significant Change of Tumor Diameter as Determined by Endoscopic Ultrasound (EUS) Imaging - Kann, P H; Kann, B; Fassbender, W J; Forst, T; Bartsch, D K; Langer, P (Experimental and Clinical Endocrinology & Diabetes, 2006)