Text and Data Mining valid from 2020-02-28
Received: 26 July 2019
Accepted: 10 December 2019
First Online: 28 February 2020
Ethics approval and consent to participate
: The study was approved by the local ethics committee (CPP IV Sud-Méditerranée, Montpellier, France) in accordance with the Helsinki Declaration and written informed consent was obtained from each patient (NCT02909998; N°2008-A01087–48).
: Not applicable.
: Yves-Marie PERS is a member of the editorial board of BMC Rheumatology. All the remaining authors declare that they have no competing interests.