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Citation: A. Chak et al., Effectiveness of endoscopy in patients admitted to the intensive care unitwith upper GI hemorrhage, GASTROIN EN, 53(1), 2001, pp. 6-13

Authors: Katzan, IL Furlan, AJ Lloyd, LE Frank, JI Harper, DL Hinchey, JA Hammel, JP Qu, A Sila, CA

Citation: Il. Katzan et al., Use of tissue-type plasminogen activator for acute ischemic stroke - The Cleveland area experience, J AM MED A, 283(9), 2000, pp. 1151-1158

Authors: Chak, A Cooper, GS Lloyd, LE Hammar, PJ Issa, K Rosenthal, GE

Citation: A. Chak et al., Effectiveness of ERCP in cholangitis: a community-based study, GASTROIN EN, 52(4), 2000, pp. 484-489

Authors: Cooper, GS Chak, A Lloyd, LE Yurchick, PJ Harper, DL Rosenthal, GE

Citation: Gs. Cooper et al., The accuracy of diagnosis and procedural codes for patients with upper GI hemorrhage, GASTROIN EN, 51(4), 2000, pp. 423-426