[1] Ctr Hosp Lisboa Ocidental, Hosp Egas Moniz, Rheumatol Dept, Lisbon, Portugal
[2] Ctr Hosp Lisboa Ocidental, Serv Reumatol, Lisbon, Portugal
[3] Leiden Univ, Med Ctr, Leiden, Netherlands
[4] Univ Sheffield, Sch Hlth & Related Res, Hlth Econ & Decis Sci, Sheffield, England
[5] Ctr Hosp Lisboa Ocidental, Hosp Egas Moniz, Lisbon, Portugal
[6] Leiden Univ, Med Ctr, Dept Rheumatol, Leiden, Netherlands
[7] Univ Amsterdam, Med Ctr, Meerssen, Netherlands
[8] Leiden Univ, Med Ctr, Portela Loures, Portugal