Acknowledgements
AFA-insurance (grant number 150571) has provided funds for the
conduction of the study and data collection and the Swedish Research
Council for Health (FORTE) (grant number 2020-01214) has provided
additional funds for salaries. We would like to thank the participating
schools and Gunnar Bergström, Charlotte Wåhlin, Kjerstin Stigmar,
Caroline Lornudd and Lotta Nybergh.