1. From the Center for Rheumatology, Albany, New York; University of California, San Francisco, and Synarc Inc., San Francisco, California; University of Alabama at Birmingham School of Medicine, Birmingham, Alabama; University of Alberta, Edmonton, Alberta, Canada; Leeds General Infirmary, Leeds, United Kingdom; Hospital Central, San Luis Potosi, Mexico; University of Medical Sciences, Wroclaw, Poland; Bristol-Myers Squibb, Princeton, New Jersey; and University Hospital Leuven, Leuven, Belgium.