Received: 28 August 2019
Accepted: 14 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: The present investigation is a part of a long-term study of risk factors associated with metabolic syndrome in patients with SLE, RA and ankylosing spondylitis, which has been approved by the Institutional Research and Ethics board of the hospital (Approval Number R-2014-1301-72). This study was conducted according to the principles expressed in the Declaration of Helsinki (last revision Fortaleza, Brazil 2013). All the participating patients previous to the study entering signed a voluntary consent form after the researchers explained the study objectives, possible scientific benefits and their potential risks.
: Not applicable.
: The authors declare that they have no competing interests.