RT Journal Article SR Electronic T1 Correction: Clinical practice guideline: evidence, recommendations and algorithm for the preoperative optimization of anemia, hyperglycemic and smoking JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP E619 OP E619 DO 10.1503/cjs.019421 VO 64 IS 6 YR 2021 UL http://canjsurg.ca/content/64/6/E619.abstract