Dr Giorgiutti and @Lupusreference present on prevalence of AAV in relation to silica exposure from quarries. Prevalence of GPA 2 fold higher in region with quarries vs city. Spatial association between quarries and GPA but not MPA/RLV. @rheumnow #ACR20 Abstr#1426 https://t.co/xHnOWCdXWe