[1] Massachusetts Gen Hosp, Boston, MA 02114 USA
[2] Duke Univ, Med Ctr, Durham, NC USA
[3] Rush Univ, Med Ctr, Chicago, IL 60612 USA
[4] Univ Utah, Salt Lake City, UT USA
[5] Cleveland Clin Fdn, 9500 Euclid Ave, Cleveland, OH 44195 USA
[6] Mayo Clin, Jacksonville, FL 32224 USA
[7] Univ Penn, Philadelphia, PA 19104 USA
[8] Mayo Clin, Rochester, MN USA
[9] Boston Med Ctr, Boston, MA USA
[10] Univ Pittsburgh, Sch Med, Pittsburgh, PA USA
[11] Univ N Carolina, Chapel Hill, NC USA
[12] Hosp Special Surg, 535 E 70th St, New York, NY 10021 USA
[13] Wallace Rheumat Dis Res Ctr, Los Angeles, CA USA
[14] F Hoffmann La Roche Ltd, Basel, Switzerland
[15] Genentech Inc, San Francisco, CA 94080 USA
[16] Prn Stat Consulting Serv Ltd, Ely, Cambs, England