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Dahl and M. Gehrchen have received institutional grants from K2M and Medtronic. J. Heydemann is a comitee member of POSNA, AACPDM and SRS and shareholder in Merck, Sanofi Avanti and Orthopediatrics, unrelated to this work. L. Deveza is a shareholder in Lento Medical Inc. and has received research funding from OREF (Orthopedic Research an Education Fund), unrelated to this work. C. Dragsted, S. Ohrt-Nissen, M. Jain, D. Liu and S. Fruergaard have no conflicts of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}