The concomitant use of the renin–angiotensin system inhibitors and survival outcomes of patients with pancreatic adenocarcinoma: an analysis from a tertiary center oleh Kuan-Yu Tseng, Chiann-Yi Hsu, Yu-Hsuan Shih, Hsin-Chen Lin, You-Cheng Li, Chieh-Lin Jerry Teng, Cheng-Wei Chou