AU - Spiegel BR, Vakil NB, Ofman JJ TI - Endoscopy for acute nonvariceal upper gastrointestinal tract hemorrhage: Is sooner better?: a systematic review PT - JOUR DP - 2001 TA - Archives of Internal Medicine pages = {1393-1404}, VI - 161 IP - 11 AID - 10.1001/archinte.161.11.1393 [doi] 4100 - http://dx.doi.org/10.1001/archinte.161.11.1393 SO - Archives of Internal Medicine June 11, 2001 161(11):1393