[1] Ctr Hosp Lisboa Ocidental, Hosp Egas Moniz, Rheumatol, Lisbon, Portugal
[2] Nova Med Sch, Comprehens Hlth Res Ctr, Lisbon, Portugal
[3] Nova Med Sch, Fac Ciencias Med, Lisbon, Portugal
[4] Leiden Univ Med Ctr LUMC, Rheumatol, Leiden, Netherlands
[5] Zuyderland MC, Rheumatol, Heerlen, Netherlands
[6] Univ Sheffield, Sch Hlth & Related Res, Hlth Econ & Decis Sci, Sheffield, S Yorkshire, England
[7] Amsterdam Rheumatol Ctr, Rheumatol & Clin Immunol, Amsterdam, Netherlands