Competing Interests

The authors declare no competing interests.

Grant and Funding Support

None.

Writing Assistance

None.

Financial Disclosure

No financial disclosures were reported by the authors of this paper.

Ethical Approval

Statement: This is an observational study. The Providence Veterans Affairs Medical Center has confirmed that no ethical approval is required.

Conflict of interest

None of the authors have funding sources or institutional and corporate affiliations that supported this work.