Hospitalizations and severe complications following acute sinusitis in general practice: a registry-based cohort study.

"Transparency declarations: The authors declare that they have no competing interests. The data were provided by the Norwegian Directorate of Health, the Norwegian Institute of Public Health (NIPH) and Statistics Norway by permission. NIPH linked and anonymized the data, which cannot be shared publicly due to restrictions by the Norwegian Data Protection Authority.: Author contributionsG.H.F. and S.H. selected and applied for the data. M.S. and L.E. analysed the data and wrote the manuscript. G.H.F contributed to analysis and writing of manuscript. A.M.B., S.H. and J.S. contributed to conception of the work and interpretation of data, and revised the manuscript."

"Funding Norwegian Research Council (GRANT number: 288165) as a part of the BASIC project (Better Treatment for Acute Sinusitis in Primary Care)."