00645naa#a2200217#i#450# EN\\bibl\56879 20241222114947.7 2712-8164 20210925b2021####ek#y0engy0150####ca RUS RU FEATURES OF PERFORATIVE GASTRODUODENAL ULCER IN CANCER PATIENTS Journal article Astrakhan Astrakhan State Medical University 2021 6 с. Journal article local . 616.33-002.44-006.6 RUS Panin Stanislav I Kovalenko Nadezhda V Postolov Mikhail P Suvorov Vladimir A kaspmed.ru