Endoscopic ultrasound-guided tissue sampling of small subepithelial tumors of the upper gastrointestinal tract with a 22-gauge core biopsy needle
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R. Schmid | S. Wagenpfeil | C. Schlag | C. Menzel | M. Götzberger | S. Nennstiel | P. Klare | G. Weirich | S. von Delius