[1] Boston Univ, Sch Med, Dept Med, Rheumatol Sect, Boston, MA 02118 USA
[2] Univ N Carolina, Chapel Hill, NC USA
[3] Med Univ Lubeck, D-23538 Lubeck, Germany
[4] Univ Paris 05, Paris, France
[5] Hop Cochin, Assistance Publ Hop Paris, F-75674 Paris, France
[6] Cleveland Clin Fdn, Cleveland, OH 44195 USA
[7] Addenbrookes Hosp, Cambridge, England
[8] Univ Groningen, Univ Med Ctr Groningen, NL-9700 AB Groningen, Netherlands
[9] Univ Oxford, Oxford, England
[10] Univ Paris Diderot, Paris, France
[11] Hop St Louis, Assistance Publ Hop Paris, Paris, France
[12] Mayo Clin, Coll Med, Rochester, MN USA
[13] Ipswich Hosp NHS Trust, Ipswich, Suffolk, England
[14] Norwich Med Sch, Norwich, Norfolk, England