Objective To develop and validate revised classification criteria for granulomatosis with
polyangiitis (GPA). Methods Patients with vasculitis or comparator diseases were recruited into …

Objective To develop and validate revised classification criteria for eosinophilic granulomatosis
with polyangiitis (EGPA). Methods Patients with vasculitis or comparator diseases were …

Objective To develop and validate new classification criteria for Takayasu arteritis (TAK).
Methods Patients with vasculitis or comparator diseases were recruited into an international …

Multisystem inflammatory syndrome (MIS-C) is a pediatric hyperinflammation disorder
caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). It has now been …

Objective To develop and validate classification criteria for microscopic polyangiitis (MPA).
Methods Patients with vasculitis or comparator diseases were recruited into an international …

Objectives. There are no valid instruments to measure disease activity in Takayasu arteritis (TA).
We aim to provide a valid measure to assess clinical disease activity with or without …

Our purpose was to compile information on the haematological manifestations of systemic
lupus erythematosus (SLE), namely leucopenia, lymphopenia, thrombocytopenia, …

The coronavirus disease-2019 (COVID-19) pandemic is likely to pose new challenges to
the rheumatology community in the near and distant future. Some of the challenges, like the …

Objectives To analyse the influence of geolocation and ethnicity on the clinical presentation
of primary Sjögren's syndrome (SjS) at diagnosis. Methods The Big Data Sjögren Project …

Objective. To evaluate the influence of the main immunological markers on the disease
phenotype at diagnosis in a large international cohort of patients with primary Sjogren's …