Footnotes

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• Contributors ADC helped design the study, collected data, drafted and revised the initial manuscript, reviewed and approved the submitted manuscript. MI helped design the study, collected data, drafted and revised the initial manuscript, reviewed and approved the submitted manuscript. FG helped design the study, collected data, drafted and revised the initial manuscript, reviewed and approved the submitted manuscript. ERM helped design the study, drafted and revised the initial manuscript, reviewed and approved the manuscript.

• Funding This material is the result of work supported with resources and the use of facilities at the Veterans Affairs Palo Alto Healthcare System (Palo Alto, CA, USA).

• Disclaimer The contents do not represent the views of VA or the United States Government.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.