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LL and LS contributed equally.
Contributors LL, HC and MHM conceived and designed the analysis; LL and LS collected the data, performed the data analysis and drafted the manuscript; all authors critically revised the manuscript and approved the final version.
Funding This research was supported in part by NIH NLM R21 012197 (HC, LL), NLM R21 012744 (HC), and AHRQ R03 HS024743 (HC, LL).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Patient consent for publication Not required.
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