In Table 1 on page 1293 of the 22 March 2018 issue, the entries for 2 laboratory tests for type 2B von Willebrand disease are reversed. The entry for the von Willebrand factor antigen (VWF:Ag) test for should read, “Decreased to normal,” and the entry for the VWF ristocetin cofactor activity (VWF:RCo) test should read, “Usually low.” The errors have been corrected in the online version, which now differs from the print version.

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