Ensuring the integrity of the medical literature is a high priority of the Editors of The Journal and its publisher, Elsevier Inc. When an error is brought to our attention, we maintain the accuracy of the literature by publishing an update as appropriate: (1) erratum (minor publishing error); (2) correction (minor author error); or (3) retraction (major error). According to the Committee on Publication Ethics, retractions are reserved for articles with clear evidence that the findings are unreliable (either as a result of misconduct or honest error); have been previously published elsewhere without proper cross-referencing, permission, or justification; contain plagiarized material; and/or report unethical research (http://publicationethics.org/files/retraction%20guidelines.pdf).Although the update itself links to the previously published article, how do readers know by looking at an article whether an update has been published? In the past, it was not always easy to find. To solve that problem, CrossRef, makers of CrossCheck and FundRef, have created CrossMark, a multipublisher initiative that allows journals to create an interactive reading experience that notifies readers when updates have been made. Beginning with this issue, the CrossMark logo (as depicted on the left) in print articles indicates that The Journal is an active participant in the CrossMark program. However, the logo comes to life in the online version of The Journal’s articles. By clicking the CrossMark logo, readers will be directed to a page that states whether the article is current or an update has been published. If a correction, erratum, retraction, etc, has been published for an article, readers will be provided with a direct link and citation to the update. There is no charge to access CrossMark information; however, the CrossMark logo does not indicate whether the article itself is freely available. Additional information about CrossMark is available at http://www.crossref.org/crossmark. We hope that you find CrossMark to be a useful tool when reading The Journal, as well as other journals participating in this program. Ensuring the integrity of the medical literature is a high priority of the Editors of The Journal and its publisher, Elsevier Inc. When an error is brought to our attention, we maintain the accuracy of the literature by publishing an update as appropriate: (1) erratum (minor publishing error); (2) correction (minor author error); or (3) retraction (major error). According to the Committee on Publication Ethics, retractions are reserved for articles with clear evidence that the findings are unreliable (either as a result of misconduct or honest error); have been previously published elsewhere without proper cross-referencing, permission, or justification; contain plagiarized material; and/or report unethical research (http://publicationethics.org/files/retraction%20guidelines.pdf). Although the update itself links to the previously published article, how do readers know by looking at an article whether an update has been published? In the past, it was not always easy to find. To solve that problem, CrossRef, makers of CrossCheck and FundRef, have created CrossMark, a multipublisher initiative that allows journals to create an interactive reading experience that notifies readers when updates have been made. Beginning with this issue, the CrossMark logo (as depicted on the left) in print articles indicates that The Journal is an active participant in the CrossMark program. However, the logo comes to life in the online version of The Journal’s articles. By clicking the CrossMark logo, readers will be directed to a page that states whether the article is current or an update has been published. If a correction, erratum, retraction, etc, has been published for an article, readers will be provided with a direct link and citation to the update. There is no charge to access CrossMark information; however, the CrossMark logo does not indicate whether the article itself is freely available. Additional information about CrossMark is available at http://www.crossref.org/crossmark. We hope that you find CrossMark to be a useful tool when reading The Journal, as well as other journals participating in this program.