Effects of pre-operative oral carbohydrates on insulin resistance and postoperative recovery in diabetic patients undergoing coronary artery bypass grafting: study protocol for a prospective, single-blind, randomized controlled trial - Shicheng Zhang; Lixian He; Yiping Yu; Xin Yuan; Tao Yang; Fuxia Yan; Fei Xu; Yan Zhang; Shiwei Pan; Huaijun Zhang; Zujun Chen; Lu Xie; et al. (Trials, 2022)