BMJ Open Stalfors, J, Ovesen, T, Bertelsen, J B, Bugten, V, Wennberg, S & Sunnergren, O 2022, ' Comparison of clinical practice of tonsil surgery from quality register data from Sweden and Norway and one clinic in Denmark ', BMJ Open, vol. 12, no. 4, e056551 . https://doi.org/10.1136/bmjopen-2021-056551