[1] Ctr Hosp Baixo Vouga, Rheumatol, Aveiro, Portugal
[2] Egas Moniz Hlth Alliance Acad Clin Ctr, Aveiro, Portugal
[3] Univ Aveiro, Dept Math, Aveiro, Portugal
[4] Hosp Garcia Orta, Rheumatol, Almada, Portugal
[5] Ctr Hosp & Univ Coimbra, Rheumatol, Coimbra, Portugal
[6] Univ Beira Interior, Fac Hlth Sci, Covilha, Portugal
[7] Hosp Braga, Rheumatol, Braga, Portugal
[8] Ctr Hosp & Univ Sao Joao, Rheumatol, Porto, Portugal
[9] Hosp Distrital Santarem, Rheumatol, Santarem, Portugal
[10] Hosp Distrital Santarem, Clin Pathol, Santarem, Portugal
[11] Ctr Hosp Leiria, Rheumatol, Leiria, Portugal
[12] Univ Beira Interior, Fac Hlth Sci, Covilha, Portugal
[13] ULS Castelo Branco, Rheumatol, Castelo Branco, Portugal
[14] Hosp Nelio Mendonca, Rheumatol, Funchal, Portugal
[15] Ctr Hosp Univ Lisboa Cent, Rheumatol, Lisbon, Portugal
[16] Univ NOVA Lisboa, Comprehens Hlth Res Ctr, Lisbon, Portugal