Severe infections in Portuguese patients with rheumatoid arthritis under biologic treatment – a multicenter, nationwide study (SIPPRA-B Study)

Oliveira Pinheiro F; Seabra Rato M; Madureira P; Araújo F; Salvador MJ; Fraga V; Brites L; Cunha Santos F; Silva A; Lopes AR; Cruz M; Vilas Boas JP; Pontes Ferreira M; Samões B; Beirão T; Santos I; Carvalho D; Costa L; Bernardes M;