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Contributors Study concept and design, acquisition, analysis or interpretation of data, and critical revision of the manuscript for important intellectual content: all authors. Drafting of the manuscript: KKB, CK and SK. Statistical analysis: KKB and JM. Study supervision: SK.
Funding US Department of Veterans Affairs.
Competing interests None declared.
Ethics approval Vanderbilt University Institutional Review Board.
Provenance and peer review Not commissioned; externally peer reviewed.
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