Authors: K Visser; W Katchamart; E Loza; J A Martinez-Lopez; C Salliot; J Trudeau; C Bombardier; L Carmona; D van der Heijde; J W J Bijlsma; D T Boumpas; H Canhao; C J Edwards; V Hamuryudan; T K Kvien; B F Leeb; E M Martín-Mola; H Mielants; U Müller-Ladner; G Murphy; M Østergaard; I A Pereira; C Ramos-Remus; G Valentini; J Zochling; M Dougados Journal: Ann Rheum Dis Date: 2008-11-25 Impact factor: 19.103