[1] Univ Brescia, ASST Spedali Civili Brescia, Brescia, Italy
[2] Ist Sci San Raffaele, Milan, Italy
[3] Royal Free Hosp, London, England
[4] UCL, Med Sch, London, England
[5] Univ Pavia, Hosp IRCCS Policlin S Matteo Fdn Pavia, Pavia, Italy
[6] Leiden Univ Med Ctr LUMC, Leiden, Netherlands
[7] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[8] Univ Hosp Zurich, Zurich, Switzerland
[9] Univ Paris 05, Paris, France
[10] Cochin Hosp, Paris, France