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LNB and CK are co-first authors.
Contributors RPD was responsible for study concept and design. LNB, CK and JR acquired, analysed and interpreted data and were responsible for drafting of the manuscript. All authors provided critical revision for the manuscript as well as administrative, technical and material support.
Competing interests RPD is supported by grants from the Centers for Disease Control and Prevention (CDC) and National Institutes of Health (NIH) and is also chair of the Colorado Skin Cancer Prevention Task Force. LNB and RPD are employed by the US Department of Veterans Affairs. The CDC, NIH, and US Department of Veterans Affairs were not involved in the creation of this manuscript and its contents do not express their opinions.
Provenance and peer review Not commissioned; internally peer reviewed.