 the Strengthening the Reporting of Observational Studies in Epidemiology, STROBE, Initiative Developed Guidelines for Reporting Observational Studies. These guidelines include a checklist of 22 items related to the title, abstract, introduction, methods, results, and discussion sections of articles. Additionally, a separate explanation and elaboration document is published separately and is freely available on the web sites of Piloas Medicine, Annals of Internal Medicine, and Epidemiology. This article was authored by Eric von Elm, Douglas G. Altman, Mathias Eger, and others.