1 Epidemiology Unit, Italian Society for Rheumatology, Milan; Division of Rheumatology, ASST Grande Ospedale Metropolitano Niguarda, Milano. nicola.ughi@ospedaleniguarda.it.
2 Rheumatology Unit, Azienda Ospedaliera San Camillo-Forlanini, Roma. giandoreum@libero.it.
3 Rheumatology Unit, Department of Medicine, University of Perugia, Perugia. roberto.gerli@unipg.it.
4 Rheumatology Unit, Department of Internal Medicine, Azienda Ospedaliera ASMN IRCCS, Reggio Emilia. carlo.salvarani@ausl.re.it.
5 Epidemiology Unit, Italian Society for Rheumatology, Milan; Rheumatology Unit, Azienda Ospedaliera Città della Salute e della Scienza di Torino, Torino. simone.parisi@hotmail.it.
6 Epidemiology Unit, Italian Society for Rheumatology, Milan; Department of Medicine, Internal Medicine and Rheumatology Unit, Azienda Ospedaliero-universitaria di Parma, Parma. atendoro@gmail.com.
7 Epidemiology Unit, Italian Society for Rheumatology, Milan; Rheumatology Unit, Azienda Ospedaliera San Camillo-Forlanini, Roma. immaprevete@virgilio.it.
8 Epidemiology Unit, Italian Society for Rheumatology, Milan; Department of Rheumatology, ASST Gaetano Pini-CTO, Milano. maria.manara@gmail.com.
9 Epidemiology Unit, Italian Society for Rheumatology, Milan. f.rumi@reumatologia.it.
10 Epidemiology Unit, Italian Society for Rheumatology, Milan;Department of Medical Sciences, Rheumatology Section, University of Ferrara, Azienda Ospedaliero- Universitaria Sant'Anna di Cona, Ferrara. c.scire@reumatologia.it.
11 Epidemiology Unit, Italian Society for Rheumatology, Milan; Department of Medical Sciences, Rheumatology Section, University of Ferrara, Azienda Ospedaliero- Universitaria Sant'Anna di Cona, Ferrara. alessandra.bortoluzzi@unife.it.