Castillo-Carniglia, Alvaro Webster, Daniel Wintemute, Garen MOESM1 of Effect on background checks of newly-enacted comprehensive background check policies in Oregon and Washington: a synthetic control approach Additional file 1: Figure S1. Trend in the rate (per 100,000 people) of monthly handgun background checks in the United State by CBC status, 1999 – 2018. Figure S2. Trend in the rate (per 100,000 people) of monthly private party handgun background checks in Washington, July 2013 to December 2018. Policy;Firearms;Violence 2019-11-27
    https://springernature.figshare.com/articles/journal_contribution/MOESM1_of_Effect_on_background_checks_of_newly-enacted_comprehensive_background_check_policies_in_Oregon_and_Washington_a_synthetic_control_approach/11273171
10.6084/m9.figshare.11273171.v1