Percutaneous Ultrasonography-Guided Core Needle Biopsy of Gastrointestinal Lesions: What’s its Actual Role in Clinical Practice? A Retrospective Study for Safety and Effectiveness - Tombesi, P.; Postorivo, S.; Catellani, M.; Tassinari, D.; Abbasciano, V.; Sartori, S. (Ultraschall in der Medizin - European Journal of Ultrasound, 2011)