Funding for this research was provided by:
Ministerstvo Zdravotnictví Ceské Republiky (17-33127A)
Received: 18 September 2019
Accepted: 12 December 2019
First Online: 31 January 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all participants prior to enrolment and the study was approved by the Ethics committee of the Institute of Rheumatology in Prague, Czech Republic.
: Not applicable.
: The authors declare that they have no competing interests.