Serum and salivary inflammatory biomarkers in juvenile idiopathic arthritis-an explorative cross-sectional study.

"Declarations Ethics approval and consent to participateThe study was approved by The Regional Committee for Medical and Health Research Ethics (REK), REK no. 2012/542 (https://rekportalen.no/#prosjektbibliotek/prosjektregister) in accordance with the Declaration of Helsinki, and by each of the participating institutions according to Norwegian data protection regulations. Written informed consent was obtained from all participants, from parents of children younger than 16 years. The study is registered at https://clinicaltrials.gov/ with identifier NCT03904459, first posted 05/04/2019. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was funded by the Norwegian Directorate of Health, through their financial support for research at the regional Centers for Oral Health Services and Research in Norway (https://www.helsedirektoratet.no/tilskudd/etablering-og-drift-av-regionale-odontologiske422kompetansesentre). Additional funding was provided by grants from the Joint Research Committee between St. Olavs Hospital and the Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway."

"Declarations: Ethics approval and consent to participateThe study was approved by The Regional Committee for Medical and Health Research Ethics (REK), REK no. 2012/542 (https://rekportalen.no/#prosjektbibliotek/prosjektregister) in accordance with the Declaration of Helsinki, and by each of the participating institutions according to Norwegian data protection regulations. Written informed consent was obtained from all participants, from parents of children younger than 16 years. The study is registered at https://clinicaltrials.gov/ with identifier NCT03904459, first posted 05/04/2019.: Consent for publicationNot applicable.: Competing interestsThe authors declare no competing interests. Ethics approval and consent to participate: The study was approved by The Regional Committee for Medical and Health Research Ethics (REK), REK no. 2012/542 (https://rekportalen.no/#prosjektbibliotek/prosjektregister) in accordance with the Declaration of Helsinki, and by each of the participating institutions according to Norwegian data protection regulations. Written informed consent was obtained from all participants, from parents of children younger than 16 years. The study is registered at https://clinicaltrials.gov/ with identifier NCT03904459, first posted 05/04/2019."