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Contributors All authors contributed to the study design and interpretation of data. AS was responsible for the statistical analysis and prepared the first version of the manuscript. All authors approved the final version of the manuscript.
Funding This study was financially supported by ASAS. AS received a research grant from ASAS for a fellowship, during which the study analysis was performed.
Competing interests None declared.
Patient consent Obtained.
Ethics approval The study has been approved by the local ethics committees. All patients provided written informed consent at the baseline visit that also included consent for the follow-up visit.
Provenance and peer review Not commissioned; externally peer reviewed.
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