Text and Data Mining valid from 2020-03-23
Received: 1 December 2019
Accepted: 5 March 2020
First Online: 23 March 2020
Ethics approval and consent to participate
: Ethical approval was provided by the Joint Rheumatology Program(Hippokration General Hospital, 64/16-4-2015) as well as by the local institutional boards of participating centres and informed consent was provided by all patients before their inclusion in the study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.