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. 2018 Oct 18;8(10):e022173. doi: 10.1136/bmjopen-2018-022173

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© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Age-standardised and gender-standardised rate of endoscopic sinus surgery (ESS) by hospital districts in Finland (mean of the years 2013–2015). Darker colours represent higher operation rates. The circle indicates the site of the central hospital, and the size represents the number of inhabitants within the district. Districts with white circles have a medical faculty.