Mediastinal lymphadenopathy in patients with or without previous malignancy: EUS-FNA-based differential cytodiagnosis in 153 patients - Fritscher-Ravens,A.; Sriram,P.V.; Bobrowski,C.; Pforte,A.; Topalidis,T.; Krause,C. (Am J Gastroenterol 2000; 95 (9): 2278 - 84, 2000)