“Risk factors affecting morbidity and mortality in patients with perforated peptic ulcers in sub‐Saharan Africa: A systematic review”, Undergrad Res Health, vol. 1, no. 1, pp. 7–11, Mar. 2023, Accessed: Apr. 29, 2025. [Online]. Available: https://samajournals.co.za/index.php/urhj/article/view/78