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

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## Reference

1.  Greenberg JA, Zwiep TM, Sadek J, et al. Clinical practice guideline: evidence, recommendations and algorithm for the preoperative optimization of anemia, hyperglycemic and smoking. Can J Surg 2021;64:E491–509.