Danyliuk MB, Zavhorodnii SM, Kubrak MA, Boiko KA. Assessment of the condition severity and prediction of postoperative complications in elderly and senile patients with perforated gastric and duodenal ulcer. Zaporozhye Medical Journal [Internet]. 2023Dec.5 [cited 2024Jul.23];25(6):523-7. Available from: http://zmj.zsmu.edu.ua/article/view/287014