[1] Case Western Reserve Univ, Cleveland, OH 44106 USA
[2] MetroHlth Syst, Rheumatol, Cleveland, OH 44106 USA
[3] Genentech Inc, Immunol, San Francisco, CA USA
[4] Genentech Inc, Biometr, San Francisco, CA USA
[5] Everest Clin Res, Stat Sci, Markham, ON, Canada