*Give information separately for cases and controls in case-control
studies and, if applicable, for exposed and unexposed groups in cohort
and cross-sectional studies.
Note: An Explanation and Elaboration article discusses each
checklist item and gives methodological background and published
examples of transparent reporting. The STROBE checklist is best used in
conjunction with this article (freely available on the Web sites of PLoS
Medicine at http://www.plosmedicine.org/, Annals of Internal Medicine at
http://www.annals.org/, and Epidemiology at http://www.epidem.com/).
Information on the STROBE Initiative is available at www.-statement.org.