[1] Massachusetts Gen Hosp, Rheumatol Unit, Boston, MA 02114 USA
[2] Queen Elizabeth Hosp, Hong Kong, Hong Kong, Peoples R China
[3] Dalhousie Univ, Halifax, NS, Canada
[4] Univ Amsterdam, Amsterdam, Netherlands
[5] Kobe Univ, Grad Sch Med, Kobe, Hyogo 657, Japan
[6] Kobe Kaisei Hosp, Kobe, Hyogo, Japan
[7] Mayo Clin Fdn, Rochester, MN USA
[8] Tech Univ Munich, Munich, Germany
[9] Tokyo Metropolitan Komagome Hosp, Tokyo, Japan
[10] Kanazawa Med Ctr, Kanazawa, Ishikawa, Japan
[11] Shinshu Univ, Matsumoto, Nagano 390, Japan
[12] Kanazawa Univ, Grad Sch Med Sci, Kanazawa, Ishikawa, Japan
[13] Kanazawa Med Univ, Uchinada, Ishikawa 92002, Japan
[14] Kurashiki Cent Hosp, Kurashiki, Okayama, Japan
[15] Kansai Med Univ, Hirakata, Osaka, Japan
[16] Seoul Natl Univ, Coll Med, Seoul, South Korea
[17] Nagaoka Red Cross Hosp, Nagaoka, Niigata, Japan
[18] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Okayama, Japan
[19] UCL, London, England
[20] Univ Coll London Hosp, London, England
[21] Sapporo Med Univ, Sch Med, Sapporo, Hokkaido, Japan
[22] Univ Verona, I-37100 Verona, Italy
[23] Kings Coll London, London WC2R 2LS, England
[24] Kings Coll Hosp London, London, England