[1] Univ Calif San Francisco, San Francisco, CA 94143 USA
[2] Univ British Columbia, Sch Populat & Publ Hlth, Vancouver, BC, Canada
[3] Duke Univ, Durham, NC USA
[4] Massachusetts Gen Hosp, Boston, MA 02114 USA
[5] Emory Univ, Atlanta, GA 30322 USA
[6] Brigham & Womens Hosp, 75 Francis St, Boston, MA 02115 USA
[7] Univ Nebraska Med Ctr, Omaha, NE USA
[8] Natl Data Bank Rheumat Dis, Wichita, KS USA
[9] Cincinnati Childrens Hosp Med Ctr, James M Anderson Ctr Hlth Syst Excellence, Cincinnati, OH 45229 USA
[10] Med Univ South Carolina, Charleston, SC 29425 USA
[11] Rheumatol Associates, Dallas, TX USA
[12] Dallas Vet Affairs Med Ctr, Dallas, TX USA
[13] Univ Texas Southwestern Med Ctr Dallas, Dallas, TX 75390 USA
[14] Stanford Sch Med, Stanford, CA USA
[15] Amer Coll Rheumatol, 60 Execut Pk S,Suite 150, Atlanta, GA 30329 USA