Author Contributions: All of the authors had
full access to all of the data in the study and take responsibility for the
integrity of the data and the accuracy of the data analysis except for the
few cases mentioned in the tables.
Study concept and design: Singh, Armstrong,
Acquisition of data: Singh, Lipsky.
Analysis and interpretation of data: Singh,
Drafting of the manuscript: Singh, Armstrong,
Critical revision of the manuscript for important
intellectual content: Singh, Armstrong, Lipsky.
Statistical analysis: Singh.
Administrative, technical, or material support:
Singh, Armstrong, Lipsky.
Study supervision: Lipsky.
Role of the Sponsor: There was no sponsor for
this study and no agency or company reviewed the manuscript.
Acknowledgment: We thank VA Puget Sound Healthcare
System employees Ted Hamilton, MLIS, for his invaluable assistance with the
literature searches, and Christopher Pacheco for providing the initial version
of the monofilament figure. We also thank Edward J. Boyko, MD, MPH, for his
time and expertise in calculating measures of effect in the tables.