I thank Dr. Vijayakumar and coauthors for their letter, which correctly identifies that Anesthesiology recently published several articles that contained citations from preprint servers, despite our clearly stated Instructions to Authors that scientific articles without peer review are not to be included as references. Allowing non–peer-reviewed citations was an error on the part of the authors and Anesthesiology.

Preprints are not peer reviewed. The journal perspective on preprints as trusted evidence, as stated traditionally in our Instructions to Authors and recently in an editorial, is clear: they are not. Dr. Vijayakumar et al. further lucidly explicate the problems with non–peer-reviewed preprints as citations. The inappropriate inclusion of preprints in articles published in Anesthesiology represented a shortcoming of the authors to read and abide the stated Instructions to Authors and a shortcoming of our editorial...

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