Using Mass Spectrometry to Quantify Rituximab and Perform Individualized Immunoglobulin Phenotyping in ANCA-Associated Vasculitis

John R. Mills, Divi Cornec, Surendra Dasari, Paula M. Ladwig, Amber M. Hummel, Melissa Cheu, David L. Murray, Maria A. Willrich, Melissa R. Snyder, Gary S. Hoffman, Cees G.M. Kallenberg, Carol A. Langford, Peter A. Merkel, Paul A. Monach, Philip Seo, Robert F. Spiera, E. William St Clair, John H. Stone, Ulrich Specks, David R. Barnidge