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In the article by Caprini et al entitled "Coagulation Changes in Acutely Bleeding Patients," which appeared in the April issue of the Archives, "preoperative" should have been "perioperative" on page 561, third column, eighth line.
ERRATUM. Arch Surg. 1972;104(5):661. doi:10.1001/archsurg.1972.04180050037009