1. Upper gastrointestinal bleeding;Antunes C,2022
2. Healthy People 2020. disparities. (2021). Accessed: August 13, 2021: https://www.healthypeople.gov/2020/about/foundation-health-measures/Disparities.
3. Robert Wood Johnson Foundation. what is health equity?. (2017). https://www.rwjf.org/en/insights/our-research/2017/05/what-is-health-equity-.html.
4. Impact of ethnicity in upper gastrointestinal hemorrhage;Wollenman CS;J Clin Gastroenterol,2014
5. WikiDoc. melena epidemiology and demographics. https://www.wikidoc.org/index.php/Melena_epidemiology_and_demographics.