Funding for this research was provided by:
Sociedade de Reumatologia do Rio Grande do Sul
Received: 28 May 2018
Accepted: 25 June 2019
First Online: 2 July 2019
: The authors declare they have no financial or non-financial competing interests regarding this work.
: Local ethics committee approved the study and all patients signed a written informed consent (Ethics Committee Approval number 425:110, on Sep 26th, 2013).
: Not applicable.