Funding for this research was provided by:
Sociedade Portuguesa de Reumatologia (NA)
Received: 21 May 2019
Accepted: 7 April 2020
First Online: 5 May 2020
Ethics approval and consent to participate
: The database information security was approved by the Portuguese National Commission for Data Protection and the ethics committees of the participating institutions. All participating patients were asked to sign an inform consent.
: Not applicable.
: The authors declare that they have no competing interests.