Correction: Clinical practice guideline: evidence, recommendations and algorithm for the preoperative optimization of anemia, hyperglycemic and smoking

In an article published on October 1, 2021,¹ Figure 1 contained an error. The middle box under “Evidence of anemia” should have read “M: Hb 100–130 g/L” and “F: Hb 100–120 g/L.”

This has been corrected at canjsurg.ca.