144. GEOGRAPHIC DIFFERENCES IN CLINICAL PRESENTATION AND OUTCOME OF ANTINEUTROPHIL CYTOPLASMIC ANTIBODY- ASSOCIATED VASCULITIS: ROLE OF ANTIBODY SPECIFICITY. (29th March 2019) - Hessels, Arno; Sanders, Jan Stephan; Schau, Bruno; Ochtrop, Manuella; Calich, Ana; de Souza, Alexandre Wagner; Li, Zhi-Ying; Chen, Min; Rutgers, Abraham; Stegeman, Coen