The predictive value of high-sensitive troponin I for perioperative risk in patients undergoing gastrointestinal tumor surgery per Yitao Zhang, Jiaojie Xue, Ling Zhou, Jinhong Si, Shiyao Cheng, Kanglin Cheng, Shuqi Yu, Mao Ouyang, Zhichong Chen, Daici Chen, Weijie Zeng