Ethical approval

EL Eric A. Larsson
UW Ulrika M. Wallgren
AS Anna Su
JS Jennifer Short
LK Lisa Kurland
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Stockholm Regional Ethical Review Board approval was obtained for this study (reference number 2012/1288–31/3). The study was performed according to the ethical standards of the 1964 Declaration of Helsinki and its later amendments. However, no written informed consent was obtained from the study participants as this was a register-based study and thus not needed according to Swedish practice [19].

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