312. LEG MUSCLE STRENGTH IS REDUCED AND IS ASSOCIATED WITH PHYSICAL QUALITY OF LIFE IN ANTINEUTROPHIL CYTOPLASMIC ANTIBODY-ASSOCIATED VASCULITIS. (29th March 2019) - Hessels, Arno; van der Hoeven, Johannes; Sanders, Jan Stephan; Brouwer, Elisabeth; Rutgers, Abraham; Stegeman, Coen