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The BARFOT study group M Ahlmén, M Andersson, S Bergman, K Dackhammar, K Forslind, I Hafström, C Keller, I Leden, B Lindell, I Petersson, C Schaufelberger, M Söderlin, B Svensson, A Teleman and J Theander.
Competing interests None.
Ethics approval This study was conducted with the approval of the Karolinska Institutet.
Provenance and peer review Not commissioned; externally peer reviewed.