1. Jensen DM, Machicado GA. Diagnosis and treatment of severe hematochezia: the role of urgent colonoscopy after purge. Gastroenterology. 1988;95:1569–74.
2. Kovacs TOG, Jensen DM. Gastrointestinal hemorrhage and occult gastrointestinal bleeding. In: Goldman L, Schafer AI, editors. Goldman – Cecil Medicine. 25th ed. Philadelphia: Elsevier Saunders; 2015. Chapter 135. p. 879–84.
3. Longstreth GF. Epidemiology and outcome of patients hospitalized with acute lower gastrointestinal hemorrhage: a population-based study. Am J Gastroenterol. 1997;92:419–24.
4. Kollef MH, O’Brian JD, Zuckerman GR, et al. BLEED: a classification tool to predict outcomes in patients with acute upper and lower gastrointestinal hemorrhage. Crit Care Med. 1997;25:1125–32.
5. Peura DA, Lanza FL, Gostout CJ, et al. The American College of Gastroenterology bleeding registry: preliminary findings. Am J Gastroenterol. 1997;92:924–8.