Text and Data Mining valid from 2018-04-06
Received: 27 February 2018
Accepted: 21 March 2018
First Online: 6 April 2018
Compliance with ethical standards
: The authors have declared no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Ethics committee of Hospital Cuf Descobertas, 8/09/2014, Ethics committee of Instituto Português de Reumatologia, 3/07/2015 and NOVA Medical School Ethics (no. 17/2016/CEFCM). All patients have signed an informed consent to participate according to the Declaration of Helsinki.